Jan 18, 2015 · Technically, given that it is designed for 35,000 psi pressures, you could load .38 Special brass for it into the +P+ territory. There is no SAAMi spec for +P+ loads, and factory +P+ ammo made for police orders varied from 23,500 psi to 30,000 psi. At the 30,000 psi level it's virtually a .357 "short" Magnum and will deliver about 90% to 95% of ...The Ruger Security Six and its variants, the Service Six and Speed Six are a product line of double action revolvers introduced in 1972 and manufactured by Sturm, Ruger & Company. These revolvers were marketed to law enforcement duty issue, military, and civilian self-defense markets.[1] The introduction of the Security Six and its variants marked Sturm Ruger's first attempt to enter the ...You’ve found a gorgeous 1955 Chevrolet Bel-Air for sale. If you want to find out as much information about the car before purchasing it, start with the serial number. Here is some ...A must-have for Ruger Security Six owners, rubber grips are the perfect upgrade for enhanced handling and a personalized touch. From $8 - Check Rubber Grips. At Amazon. Wood Grips. Wood grips for the Ruger Security Six offer a classic look and a warm, natural feel, enhancing the firearm's aesthetics and grip comfort. Preferred by many for their ...The Ruger Security-Six also sired two variants, the aforementioned Police Service-Six, chambered in .357 Mag., .38 Spl. and 9 mm, and the Speed-Six, which featured fixed sights, a rounded butt and ...A military serial number, also referred to as a service number, is a unique number assigned to all military personnel. The U.S. military used this system as a means of identificati...Original Ruger Security Six 150 Series Grips 0 results. You may also like. Ruger Security Six 150 serial # target grips Mesquite NEW MANUFACTURE. Number of bids. Ruger Security Six 150 prefix grips. …The early models had a serial number with a 150 prefix code and below had a "square" butt with a low back on the end of the frame; the idea was to control muzzle flip. The 4″ blued model pictured above is a very early 150 prefix model, made in Jan, 19 1972. ... .357 Magnum Ruger Security Six 151 Prefix Stainless Steel Model Pre-Warning.Hoy repasamos y disparamos el Ruger Security Six calibre .357 Magnum. Un revolver clasico de la famosa compañia Sturm Ruger, el Security Six fue un revolver ...TUFF1 Made in USA - Grips. Check to see if you can find any Herretts Shooting Star grips for the 150- serial number Six series frames on the internet. They are bigger than the stock grips and are very nice. Grips made for the 151- and above s/n's will not fit as the shape of the frame is different. searching for Security Six low back frame ...Security Sixes were generally .357s and had adjustable rear sights, while Speed Sixes were fixed sight guns that were made primarily in .357, but also in .38 S&W Special and 9mm Luger. Both were so-called �medium-frame� revolvers, in much the same vein as a Smith & Wesson K-frame, or the Colt D-frame, exemplified by the Diamondback.2763 posts · Joined 2014. #5 · Aug 16, 2014. I have stripped down my Speed Six and Security six and the only issue was on the Speed six the Cylinder lock piece fell out. Just have to reposition it correctly and make sure is fully seated in the trigger assembly. Also as stated, when reassembling the trigger assembly, just make sure the ...The Speed/Security/Service Six started being manufactured in 1972 so it would have to have had a serial number on it at time of manufacture. Look on the side of the frame or on the bottom of the grip to see if you can spot any signs where a serial number may have been removed. There is no way that I know of to make a gun legitimate (legal) that ...Single Six serial number. ... It was made in 1964, which had a serial number range from 380601 to 409930. Any day without learning is a day of backing up. ... A forum community dedicated to Ruger firearm owners and enthusiasts. Come join the discussion about optics, hunting, gunsmithing, styles, reviews, accessories, classifieds, and more! ...The youngest Ruger Security-Six is now about 35 years old, and it paved the way for Ruger's successful double-action revolver lineup. Ruger’s Security-Six made its debut in the early 1970s. It was a midsize, strong revolver chambered for .357 Magnum. March 11, 2022 By Bob Campbell.Ruger Security Six 150 SN. Ruger Security Six with or without bark, serial number prefix is important, there are 150 prefix and 151 and greater prefix, they are slightly different grips. There are two categories in this section, one for each. With Bark = $265.00 Without Bark = $275.00. $265.00. Shipping: With or Without Bark-Elk Stag: *. Elk Stag.The Ruger chart only shows the first serial number for each year. 156-94383 was the first # for 1981. 158-12020 was the first # for 1982. So, why would they show the 157 prefix number if a 157 numbered gun was not the first number for a certain year? That makes the 157 a 1981 gun. No assumptions.Manufacturer: Ruger Model: Security Six Serial Number: 15249328 Barrel Length: 4 Condition: Excellent . See all listings by Foothill Firearms Print this listing. Click Photo to Enlarge: Guns International #: 102598988 Seller's Inventory #: U2-18 Category - Ruger Revolvers - Security Six - .357 Magnum Revolvers.On Ruger rifles, the serial number is commonly found on the receiver or the barrel, near the chamber. For Ruger pistols, check the frame near the trigger guard or on the slide. On Ruger shotguns, look for the serial number on the barrel or receiver. Remember to use a good light source and possibly a magnifying glass to carefully examine the ...A must-have for Ruger Security Six owners, rubber grips are the perfect upgrade for enhanced handling and a personalized touch. From $8 - Check Rubber Grips. At Amazon. Wood Grips. Wood grips for the Ruger Security Six offer a classic look and a warm, natural feel, enhancing the firearm's aesthetics and grip comfort. Preferred by many for their ...Here is a very good review regarding these pistols: Ruger Security-Six .357 Magnum Revolver By David Tong Sturm, Ruger & Co. has always been a bit of a dichotomy of a gun company. They use the most modern of manufacturing methods, that of precision investment casting, much as would a jeweler or dental lab, to provide a near-final-sized raw part which thus requires a minimum of machining to ...2106 posts · Joined 2008. #29 · Mar 3, 2015. Here is a link to doing a trigger job on a SP101. The major difference between it and the earlier Six Series is the trigger return spring. However, there are enough similarities that it can give you an idea where to start. Ruger SP101 Trigger Job Guide.Ruger .357 Magnum Security Six GA36 Unfired 1980 production PMA Special Edition Stainless 6 inch with Option on Redhawk & Presentation Case . For Sale from: ... Exclusive Distributor was the Police Marksman Association of Montgomery, Alabama. Serial number 4 began 1980's production serialization; this Revolver's number is 156 prefix, 1800 ...Shooting and discussing the classic Ruger Security Six, with three different configurations on the table.----- Hickok45 videos are filmed ...THAT is in, so to speak, RUGER FIREARMS SERIAL NUMBER HISTORY on the SRinc site. And so it goes... Jul 2, 2016 #3 M. medicdave Blackhawk. Joined Feb 19, 2009 Messages 535 ... SDA-32 Service-Six / Security-Six. T.A. WORKMAN; Feb 28, 2024; Ruger & Other Firearm Collecting; Replies 3 Views 304. Mar 10, 2024. weaselmeatgravy. W. Dating serial numbers.I have a New Super Single Six with a puzzling serial number. I have called Ruger and did not get a satisfactory answer. I also looked up the serial number... Forums. New posts Search forums. ... New Single Six Serial Number. Thread starter JEDI144; Start date Jan 31, 2018; Help Support Ruger Forum: Jan 31, 2018 #1 J. JEDI144 Bearcat. Joined Jan ...Ruger made 4 different "types" of flatgates. Serial number 1 through 1985 were a type 1, which includes yours (1953~1954). Types 2 goes up to S/N 24,703. Type 3 goes up to S/N 51,494 and finally type 4 goes up to S/N 61,960 in 1957. My Blue Book of Gun Values shows your Type 1 at $1750 in 100% condition. In 98%, it's still worth over $1000.Buy Now. Compact for easy concealment, the Security-9 ® is designed to fit a variety of available holsters. Rugged construction with black oxide, through-hardened alloy steel slide and barrel and high-performance, glass-filled nylon grip frame. Precision-machined, hard-coat anodized aluminum chassis with full-length guide rails.We offer free Shipping for orders over $500. Serial #161-47483, .357 Magnum, 6 inch barrel with a bright, excellent bore. This is the Ruger model Security-Six manufactured in 1986. The stainless steel revolver is in excellent condition retaining virtually all, 98-99% original polished stainless finish with very light handling marks.For sale is a Ruger Security-Six double-action revolver in .357 Mag. Serial number -161-63609. This revolver is in good condition, with a pristine bore. The Ruger Security-Six and its variants, the Service-Six and Speed-Six are a product line of double-action revolvers introduced in 1972 and manufactured until 1988 by Sturm, Ruger & Company.Suggested Retail$439.00. Striker-fired with a short, smooth trigger pull, clean break and positive reset. Slim, lightweight and compact for personal protection. Rugged construction with through-hardened alloy steel slide; one-piece, precision-machined fire control chassis; and high-performance, glass-filled nylon grip frame.On Ruger rifles, the serial number is commonly found on the receiver or the barrel, near the chamber. For Ruger pistols, check the frame near the trigger guard or on the slide. On Ruger shotguns, look for the serial number on the barrel or receiver. Remember to use a good light source and possibly a magnifying glass to carefully examine the ...89074 said: I found this Security Six at a local shop. Serial number 150-16XXX makes it an early production gun. I hope you bought it. That is, indeed, an early one. I have a 150 series myself, and really like it. The 150 series has the "low back" grip frame which was later changed. Most prefer the high back, which is said to tame heavy recoil ...This grip will fit the older model of the Ruger Security Six with 150-xxx serial number. I recently acquired an older 150 series Security Six with the original walnut grips. The ergonomics of the grip were pretty bad, especially using .357 ammunition. The grip was simply too narrow. I started the search for something after-market but since this ...620-56728. 2008. 620-57522. 2009. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped..357 Ruger Security-Six. Stainless. Approximately 1975. 2.75-inch barrel. ... I'd already bought a brand new, still in the original Ruger box, set of Ruger target grips for a Security-Six with the serial number range of 151. The other coincidence is this gun I'm looking at is a 151-series gun. ... Fortunately Ruger didn't fit and number each ...Ruger SP101 ®. Ruger SP101. Takedown of integrated subassemblies requires no special tools, allowing for easy maintenance and re-assembly. Transfer bar mechanism provides an unparalleled measure of security against accidental discharge. Grip frame easily accommodates a variety of custom grips.A Security Six from 1980 is a high back frame model and Pachmayr made grips for it. The low back frame Six series was ONLY** 150- serial numbers, made from 1970 to 1974. In 1974, Ruger changed the design of the frame and more aftermarket (and grips contracted by Ruger, such as the Pachmayr Presentations) were available.We buy sell and trade firearms as well as consign firearms. Ruger Model: Security Six Cal: 357 Mag Description: Ruger Model: Security Six Cal: 357 Mag Action: Revolver BBL: 4 SOLDHandgun Caliber: .357 Magnum Manufacturer: Ruger Model: Security Six Serial Number: 15249328 Barrel Length: 4 Condition: Excellent.Serial Number Lookup; ... LCP ® MAX; LC380 ® Security-380 ® EC9s ® MAX-9 ® Security-9 ® Ruger-5.7 ... You can search by firearm type or by caliber in the drop down menus below or type in what you are looking for by model number, product name or specific feature. Type / Caliber Search20-77705. 1971. 21-16995. 1972. 21-53819. 1973. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.There's a Security Six near my home for sale for $299.00 w/o box, etc. It looks pretty well used but sound. I have no experience buying used revolvers. The SN is 155-330XX. Is this a good price and does anyone have any idea how old this gun is? Thank for any info at all gents.Manufacturer: Ruger Model: Security Six Serial Number: 159-/3630 Barrel Length: 2 3/4 Bore: Excellent Chambers: excellent Condition: Mint Metal Condition: Excellent Wood Condition: Excellent Bore Condition: Excellent Barrel Type: 2 3/4 Action: DA Finish: Stainless Steel Weight: 2.6 lbs1970. 60-52410. 1971. 60-81278. 1972. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.1970. 60-52410. 1971. 60-81278. 1972. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.Ruger Single Action & Double Action Revolvers . Single 6 serual # - year of manufacture ... Go to "OM Single Six" for serial # ranges. Looks like yours is 1957. Dec 20, 2009 #5 G2 Hunter. Joined May 8, 2006 ... Not that I can't find it, because once you go there you can usually get back. :shock: Serial Number History. Dec 20, 2009 #6 S ...What profile your revolver has is usually related to it's serial number prefix, so please do include that (the 150- or 151- number at the beginning of the serial). Bark coverage can be extensive or minimal. $200 with $5 shipping. Stag grips for Ruger Security-Six, Service-Six, or Speed-Six revolvers.Manufacturer: Ruger Model: Security Six Serial Number: 151-76571 Barrel Length: 2.75 . See all listings by New England Guns and Parts Print this listing. Click Photo to Enlarge: Guns International #: 102522663 Seller's Inventory #: 30421 Category - Ruger Revolvers - Security Six - .357 Magnum Pistols.Security Six serial number question. Thread starter Richard2003; Start date Dec 30, 2010; Help Support Ruger Forum: Dec 30, 2010 #1 R. Richard2003 Bearcat. Joined Oct 22, 2010 ... Welcome to the Ruger Forum. Look on the bottom of the butt. Are you sure it is not 150-0425***? If it is it was made in 1972. Dec 30, 2010 #3 R. Richard2003 Bearcat.I have shot this gun with both factory .357 mag and hand loads and this gun shoots and handles well, The revlover was made in 1977 and functions and shoots very well. Serial #152-82203 {MODERN} Price: $795.00 Handgun Caliber:.357 Magnum Manufacturer: Ruger Model: Security Six Serial Number: 152-82203 Barrel Length: 4 Condition: Very Good to ...iOS: Finding time to read is hard, but if you fancy yourself a fan of classic literature, from the likes of Jane Austen, Jules Verne, or Charles Dickens, then Serial Reader’s a cle...A fellow CA gunowner has what I'm certain is a lowback stainless Security Six and is looking for a) grips and b) ballpark value. Serial number is a "no prefix" 86407511. The serial number appears almost hand stamped, is on the frame grip butt. I did a lookup on the Ruger website and got a...Ruger Security Six SN Help? Handguns: The Revolver Forum287 posts · Joined 2017. #1 · Mar 10, 2021. I found a small country gun shop the other day. I went in there and found they had 3 old Six series revolvers, for sale on consignment. 2 Security Six models and one Police Service Six. Funds are limited (as always), but I went home with the Police Service Six. I also got to buy a box of Blazer ...A Look Back at the Ruger Security-Six Revolver. From about the mid-1960s through the 1970s, the mid-frame .357 Magnum, double-action revolver was the most popular service firearm riding on a law ...Manufacturer: Ruger Model: Security-Six Serial Number: 151-59291 Barrel Length: 4 . See all listings by Long Shot Inc Print this listing. Click Photo to Enlarge: Guns International #: 102619602 Seller's Inventory #: M-3032 Category - Ruger Revolvers - Security Six - Ruger Revolvers - Double Action.Title: Security-Six, Speed-Six and Police Service-Six Instruction Manual Created Date: 3/21/2012 9:52:27 AMHere are my questions: First, the gun is a Ruger Security Six in stainless steel with a serial number of 151-80214. It does not have all of that warning crap on the barrel. ... The Ruger Security-Six and it's $300 price tag and it's worthiness when it comes to a reliable and proven pistol, sealed my decision to buy it. Sep 1, 2009 #82004. *315-47464. 2005. *P95 Serial Numbers rollmarked with P89 Pistols beginning in 1998. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only.Ruger Security Six 150 SN. Ruger Security Six with or without bark, serial number prefix is important, there are 150 prefix and 151 and greater prefix, they are slightly different grips. There are two categories in this section, one for each. With Bark = $265.00 Without Bark = $275.00. $265.00. Shipping: With or Without Bark-Elk Stag: *. Elk Stag.Manufacturer: Ruger Model: Security - Six Serial Number: 159-62756 Caliber Info: 357 Magnum . See all listings by Long Shot Inc Print this listing. Click Photo to Enlarge: Guns International #: 101393514 Seller's Inventory #: M-2602 Category - Ruger Revolvers - Security Six - Ruger Revolvers - Double Action.1970. 60-52410. 1971. 60-81278. 1972. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.Feb 17, 2024 · February 17, 2024 by William Taylor. Wondering about the manufacturing date of your Ruger revolver? The best way to determine this is by checking the serial number. Ruger provides a serial number lookup tool on their website, which will provide the manufacturing date of your firearm. Here are answers to some commonly asked questions related to ...From about the mid-1960s through the 1970s, the mid-frame .357 Magnum, double-action revolver was the most popular service firearm riding on a law enforcement officer's hip.Beginning Serial Number: Years of Production: 740-17000: 2011: 740-23092: 2012: 740-27662: 2013: 740-33348: 2014: 740-41985: 2015 * 77/357 models were introduced in 2011 and rollmarked within the same range as 77/44 rifles. ... Ruger does not necessarily produce firearms in serial number order. There are occasions when blocks of serial numbers ...Ruger Single Action & Double Action Revolvers . Single 6 serual # - year of manufacture ... Go to "OM Single Six" for serial # ranges. Looks like yours is 1957. Dec 20, 2009 #5 G2 Hunter. Joined May 8, 2006 ... Not that I can't find it, because once you go there you can usually get back. :shock: Serial Number History. Dec 20, 2009 #6 S ...The GP100 and SP101 series handguns, designed around similar concepts as the Service Six, Speed Six, and Security Six, are the current flagships of Ruger’s double action revolver line. Peterson ...Serial Number: Caliber: $10.00 Payment Included To receive your Ruger Letter(s) of Authenticity, complete the form below and mail a personal check or money order for $10.00 per letter to: Ruger Records Department / 1 Lacey Place / Southport, Connecticut 06890 Name: Address:The 150-serial number frames can be very difficult to locate grips. Pristine grips like yours can fetch as much as $100 to right (desperate) buyer. ... (150-7xxxx) fixed sight revolver chambered in .357 Magnum and marked as Security-Six...so its seems Ruger continued the practice well after the initial 1972 run, Save Share. Like. 0 Reply. ...I thought I'd post a pic here showing the two types of Ruger Security Sixes side by side. I didn't know there was a difference until I bought my Low Back. The Low Back types have serial numbers starting with 150-xxxxx and we're the first ones made from 1972 - 1974. They're also referred to as the 150 series. The High Back types started with serial number 151-xxxxx and we're made to ...Ruger. New Model Single-Six. Family. Windage- and elevation-adjustable rear sights (available on most models) help put you on target and keep you there. Chambered for affordable rimfire shooting. Transfer bar mechanism and loading gate interlock provide an unparalleled measure of security against accidental discharge.Ruger Security six 357 Magnum 1978 Vintage Solid revolver 4" barrel for sale online. Ruger Security six 357 Magnum 1978 Vintage Solid revolver 4" barrel Toggle navigation MENUThis Ruger Security Six is in excellent condition both inside and out, and appears to have been fired VERY little since leaving the Ruger factory. More description to follow... SOLD Handgun Caliber:.38 Special, .357 Magnum Manufacturer: Ruger Model: Security Six Serial Number: 156-86963 Barrel Length: 4" Inches Condition: ExcellentSecurity-9 ® Ruger-5.7 ... Enter your Ruger® serial number above to view its model number, product line, caliber, production status, ship date and instruction manual. Note: This service is provided as reference only, and accuracy is not guaranteed.Ruger Security Six .357 Magnum Description: Ruger Security Six 357 Magnum 2.5" Barrel lightly used Very Fine Condition Price: $800.00 Buy Now Handgun Caliber:.357 Magnum Manufacturer: Ruger Model: Security Six Serial Number: 15980223 Barrel Length: 2.5Ruger Single Six Magnum Serial Number History. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.TRUGLO BRITE-SITE NIGHT SIGHTS FITS GLOCK 42 43. $49.00. Trending at $52.99. Find many great new & used options and get the best deals for Pachmayr Grips For Ruger Security Six Serial no 151 Or Higher at the best online prices at eBay! Free shipping for many products!1970. 60-52410. 1971. 60-81278. 1972. The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.Ruger New Model Single-Six Revolver Description: Serial #63-01995.22 LR, 5 1/2' barrel with an excellent, bright bore. Action trigger, but the serial number is single shot barrel I purchased, by itself with no serial numbers, with model of 91 a Ruger 10/22 with folding stock, scope and silencer, and an Automag mod.98. With over 1.5 million made, Tank knows where four of security six series are. The speed six has eluded him somehow. Ruger ’s Security Six series is a favorite of mine and was one of the best Bill Ruger ever produced. From the ‘60s to mid- ‘80s, the .357 magnum revolver was the sidearm of choice for law enforcement and security officers.Item Name: FS 3 screw Ruger Single Six convertible - Duplicate serial number Location: Ball Ground Zip Code: 30107 Item is for: Sale Only Sale Price: 390 Caliber: 22 long rifle / 22 rimfire magnum Willing to Ship: No Bill of Sale Required?: No Item Description: Shipped in 1968 and shot very little if any. This is a duplicate serial number, it has a "D" in front of the serial number.Fixed and adjustable iron open. The Ruger Security-Six and its variants, the Service-Six and Speed-Six are a product line of double-action revolvers introduced in 1972 and manufactured until 1988 by Sturm, Ruger & Co. These revolvers were marketed to law enforcement duty issue, military, and civilian self-defense markets.Late in the "150-" serial number prefix range, the grip frame of the Security-Six was changed to a "highback" shape. After that, revolvers with "highback" grip …I have a 3 screw Ruger Single Six .22 caliber with a .22 magnum conversion cylinder. The serial number is 20-11665. I cannot find anything about this pistol on Rugers site regarding model number and year produced. I would greatly appreciate any help regarding value and information related to this gun.I have a 3 screw Ruger Single Six .22 caliber with a .22 magnum conversion cylinder. The serial number is 20-11665. I cannot find anything about this pistol on Rugers site regarding model number and year produced. I would greatly appreciate any help regarding value and information related to this gun.I didn't know if someone could tell me how much my Ruger security 6 is worth? The serial number begins with 161-, Im assuming my pistol was made between 1985 and 1986. I couldn't find any information from ruger. ... a 159- security six for$650, and a 160? Speed six for a bit higher, at the Prescott Valley gun show. Save Share.Feb 15, 2013 · My 150-Series Security-Six duty revolver! In April 1973 I purchased my first .357, a Ruger Security-Six in blue steel, four-inch barrel, and adjustable sights. This was to be my new duty revolver to replace my Department-issued S&W Model 10, which was in blue and had a 4" tapered barrel. In 1973 law enforcement, in this country, started heading ...Thanks, that is starting to make some sense. I have always been aware it is a .38 only, but that is what I wanted since I already had three of the Security Six style in 357 mag. I also figured with a serial number 03441 it was a very early gun. Apr 17, 2022.Ruger Single Action & Double Action Revolvers . Single 6 serual # - year of manu, Above information I posted DID come from Ruger's serial number website by the way..... Marlins: , Sturm, Ruger & Co., Inc. is one of the nation's leading manufacturers of rugg, In a bid to further expand into the world of audio producti, 4,480. Location. Lemont, PA, USA 16851. A couple good pictures w, Security-9 ® Ruger-5.7 ... New Model Single-Six ... Enter your Ruger®, Jun 1, 2022 · 89074 said: I found this Security Six at a local shop. Se, I was checking my security-six revolver and I cannot find the seri, This grip will fit the older model of the Ruger Security Six with 1, Grooves6. Twist1:10" RH. Available in CANo. Av, Where is the serial number on a Ruger Security Six 357? A letter “U” , Customer service confirmed: "Single-Six serial number 4, The early models had a serial number with a 150 pre, The GP100 and SP101 series handguns, designed around similar concepts, 20-77705. 1971. 21-16995. 1972. 21-53819. 1973. The, How to Check a Serial Number on a Gun (How to Check a , This included the Speed-Six, Service-Six, and Police, In 1959 when Ruger came out with the Single-Six with a .