Sako TRG Sako TRG - 22 / 42 sniper rifles were developed by the Finnish firearm manufacturer SAKO of Riihimäki . The TRG - 22 is designed to fire standard . 308 Winchester ammunition , while the TRG - 42 is designed to fire more powerful . 300 Winchester Magnum and . 338 Lapua Magnum ammunition and therefore has a larger action and barrel as standard . The rifles are available with olive drab green , desert tan / coyote brown , dark earth or black stocks , and are also available with a folding stock . Normally muzzle brakes are fitted to reduce recoil , jump and flash . The Sako factory TRG muzzle brakes vent sideways and are detachable . Generally TRGs are outfitted with a Zeiss or Schmidt & Bender PM II telescopic sight with fixed power of magnification or with variable magnification . Variable telescopic sights can be used if the operator wants more flexibility to shoot at varying ranges , or when a wide field of view is required . History . In 1989 Sako Ltd . ( Riihimäki , Finland ) introduced the TRG - 21 precision rifle as a sniper rifle model chambered for the . 308 Winchester cartridge . A more hunting oriented variation of the TRG was later introduced as the TRG - S M995 , which uses the same receiver ( short action ) and bolt ( different bolt handle ) as the TRG - 21 with the exception that the receiver is open at the top rather than possessing a cartridge ejection port on the right side as found with the TRG - 21 . Subsequently , a second sniper rifle with a 20 mm longer scaled up magnum action emerged as the TRG - 41 in order to take advantage of the . 338 Lapua Magnum cartridge . Similarly , a hunting variant of this model , again using the same bolt ( different bolt handle ) and with the receiver open at the top was introduced as the TRG - S M995 Mag in magnum calibres up to . 338 Lapua Magnum . Even though the TRG - 21 obtained its origins from the successful Sako TR - 6 target rifle , the 4 . 7 kg ( 10 lb 6 oz ) TRG - 21 was designed as a result of a thorough study of sniper requirements . With the introduction of the TRG bolt - action , Sako moved away from the modified two - lug Mauser bolt - actions , favoured during the past , to an action with a symmetrical three - lug bolt of 19 mm Ø , displaying a locking surface of 75 mm² ( 0 . 116 in² ) . The evolution of this design continues to the present and can be found in Sako ' s most recent hunting rifle offerings , the Sako 75 and the Sako 85 . To make the TRG system more suitable for military use , Sako upgraded and improved the TRG - 21 / 41 design in the late 1990s . Some TRG accessories like the muzzle brake and bipod ( that lets the rifle swivel or " hang " near its bore axis offering a more stable shooting position with large and heavy aiming optics mounted ) were also improved . This resulted in the TRG - 22 / 42 rifle system . Around 2011 an American Sako vendor commissioned a special limited production run of TRG - 22 rifles chambered for the . 260 Remington cartridge and started offering these rifles as of May 2011 . Sako never totally forgot the target rifle origins of the TRG system . The necessary accessories to attach sighting components such as match grade peep sights or target aperture sights and a mirage strap are all available . Equipped with these accessories the TRG can be used for non military or law enforcement tasks such as 300 m UIT standard rifle competition , CISM competition or other kinds of full bore target shooting . The rifle is commonly seen in long - range competition where it has done very well . Besides civilian target shooting the TRG system can and is sometimes used for hunting . The TRG system ’ s purposive design features , reliability in adverse conditions and consistent accuracy performance ( a capable marksman can expect ≤ 0 . 5 MOA consistent accuracy with appropriate ammunition ) have made it a popular , though expensive , sniper platform . Design details . The TRG system is almost unique in being a purpose - designed sniper rifle , rather than an accurised version of an existing , general - purpose rifle . The rifles can have a matte or manganese phosphatised finish . Features . The heart of the TRG system is a cold - hammer forged receiver and barrel . Both provide maximum strength for minimum weight as well as excellent resistance to wear . The " resistance free " bolt has three massive lugs and requires a 60 - degree bolt rotation and a 98 mm ( 3 . 86 in ) bolt throw for the short and 118 mm ( 4 . 65 in ) bolt throw for the long bolt - action ; these features should be appreciated by the shooter during multiple firings that require rapid projectile placement on the target . The bolt handle is the appropriate length and sports a large synthetic bulbous knob that provides a firm , positive grip . On top of the receiver a 17 mm ( 0 . 67 in ) integral dovetail rail with shape connection drillings for one or more recoil lugs provides for fixing mounting components to accommodate different types of optical or electro - optical sights . Folding iron sights can be obtained for secondary or emergency use . The receiver ' s large bedding surface is mated to an aluminium alloy - bedding block by three screws for maximum stability . This combination ensures an unusually high degree of stability . Barrel . The free - floating , heavy , chrome moly barrels ( chrome moly barrels resist throat erosion better offering a longer accuracy life than stainless steel barrels ) for the available cartridge chamberings all have a different length , groove cutting and rifling twist rate optimized for their respective chambering and intended ammunition . The . 260 Remington , . 308 Winchester , . 300 Winchester Magnum and . 338 Lapua Magnum chamberings are available with barrels of common length for sniper rifles and relatively short 510 mm ( 20 . 08 in ) long barrels . On special order TRG rifles can also be supplied with stainless steel barrels . Two types of flash eliminator / muzzle brakes are available as an accessory with one being threaded to accommodate a sound - suppressor . For the . 260 Remington chambering a non - traditional 203 mm ( 1 in 8 inch ) or 31 . 2 calibers right - hand twist rate optimized to stabilize longer , heavier very - low - drag bullets was selected over the standard 229 mm ( 1 in 9 inch ) or 35 . 2 calibers twist rate . The TRG - 22 can be ordered cambered for the . 260 Remington cartridge as of May 2011 . The introduction of the . 260 Remington ( 6 . 5x51mm ) chambering does not introduce major technical changes for the TRG system since the . 260 Remington is essentially a necked down 6 . 5 mm ( . 264 in ) variant of the . 308 Winchester ( 7 . 62x51mm ) cartridge , meaning these cartridges can be used in . 308 Winchester chambered rifles only requiring different barrels . For the . 308 Winchester chambering the 280 mm ( 1 in 11 inch ) or 36 . 7 calibers right - hand twist rate with four grooves was selected over the 305 mm ( 1 in 12 inch ) or 40 calibers , traditionally found for the . 308 Winchester , as a compromise when switching between supersonic and subsonic cartridges . The . 300 Winchester Magnum chambering also has a non - traditional 280 mm ( 1 in 11 inch ) or 36 . 7 calibers right - hand twist rate . For the . 338 Lapua Magnum chambering a non - traditional 305 mm ( 1 in 12 inch ) or 36 . 4 calibers right - hand twist rate was selected to optimize the rifle for firing 16 . 2 gram ( 250 grain ) . 338 - calibre very - low - drag bullets . As of 2009 . 338 Lapua Magnum barrels can also be supplied with a 254 mm ( 1 in 10 inch ) or 30 . 3 calibers twist rate optimized to stabilize longer , heavier very - low - drag bullets like the Sierra HPBT MatchKing and Lapua Scenar . 338 - calibre 19 . 44 gram ( 300 grain ) bullets . The traditional 254 mm ( 1 in 10 inch ) has since become the standard twist rate for the . 338 Lapua Magnum chambering . Safety . The safety lever is located in front of the trigger inside of the trigger guard and can be operated without producing mechanical noise . The two - position safety locks the trigger mechanism , locks the bolt in closed position and blocks the firing pin . The safety is on when it is in its rearmost position . It is off when it is pushed to its most forward position . When the weapon is cocked the firing pin protrudes 1 . 6 mm ( 0 . 06 in ) from the rear of the bolt - action , making it possible to feel if the weapon is ready to fire or not in poor visibility . Trigger . The two - stage trigger mechanism displays an adjustable trigger pull weight of 1 to 2 . 5 kg ( 2 to 5 lb ) and can be adjusted for length , horizontal and vertical pitch . The advantage of these features is to prevent trigger movement in an inappropriate direction that would cause the rifle to move off target . Trigger travel is short with no noticeable over - travel . As a safety factor , a safety notch is incorporated into the trigger in order to prevent discharge resulting from a strong impact on the rifle . The smooth operating safety lever is located inside the trigger - guard . It locks the trigger mechanism in addition to locking the bolt in a closed position and to blocking the firing pin . The firing pin travel is 6 . 5 mm ( 0 . 26 in ) . The trigger mechanism can be removed without additional disassembling of the rifle . Ammunition feeding . The detachable box magazine is based upon centre feeding for maximum reliability as well as precise positioning of the cartridge into the chamber . Stock . The TRG stock design is besides sniping requirements , designed to conform to both UIT and CISM regulations . Sako offers black , green , desert tan or dark earth coloured stock variants and the green , desert tan or dark earth stock variants are 0 . 2 kg ( 0 . 4 lb ) heavier than the black variants . In 2011 Sako also began offering stocks in several styles of digital camouflage . The base of the ergonomic injection - moulded polyurethane forestock is made of aluminium and encompasses the bedding block with the bedding block serving as a point of attachment for a bipod . The polyurethane buttstock with its pistol grip and integrated aluminium skeleton to add strength , is designed for right - and left - handed shooters . The rear of the buttstock possesses a series of spacer and angle plates to regulate the length of pull and curvature adjustments that can be tailored for the individual shooter . The buttplate is adjustable for both height and pitch . Finally , the cheek - piece is adjustable for both height and pitch as well . The stock features two steel sling swivel attachment sockets positioned at the right and left rear sides of the buttstock . Forward sling attachment is achieved by inserting and fixing a metal sling mount into a metal rail which runs under the forestock or fore end . This forward sling attachment point can be ( re ) positioned along the length of the rail for right - or left - handed use and is fixed with a screw . The factory carrying / shooting sling itself features quick mountable and detachable metal swivels . The swivels are mounted by pushing them into an attachment socket and detached by pushing integrated buttons in the swivels and pulling them out of the attachment sockets . A folding skeleton type buttstock designed for right - and left - handed shooters is also available . The folding stock is 0 . 5 kg ( 1 . 1 lb ) heavier than the non - folding green , desert tan or dark earth stock variants and is hinged behind the pistol grip ; it folds to the left side and locks into position . When folded , the rifle becomes 250 mm ( 9 . 84 in ) shorter . The steel parts of the folding stock are manganese phosphatised and the polyurethane parts are coloured olive drab or desert tan . The rear of the buttstock is adjustable for length of pull and height . The cheek - piece and rear support are also adjustable for height . These adjustment options allow shooters of various sizes and shapes to tailor the TRG folding stock to their personal preferences , which is an uncommon feature for folding stocks . The pistol grip body has a steel loop for a hook type military sling swivel . Sako TRG folding stock rifles are supplied with a Picatinny rail for mounting aiming optics . The folding stock was later redesigned with the most conspicuous change being a bigger " foot " with an external lever / hinge support system monopod instead of the vertical moving small " spike " found on the earlier folding stock . Accessories . Sako accessories for the TRG system include auxiliary iron sights for emergency use , a muzzle brake / flash - hider , match sight mounting set , telescopic sight mounting sets , STANAG 2324 ( Picatinny rail ) , accessory ITRS tri - rail for TRG forestock , accessory rail for TRG forestock ( bottom ) , night sight adapter , silencer ( sound suppressor ) , muzzle thread protector , various slings and swivels , cleaning kits , soft case , and a heavy - duty transit case . Several versions of TRG - specific bipods were produced that all lock into an attachment point in the aluminium bedding block at the end of the forestock . The latest bipod version is one of a few rifle bipods that lets the rifle swivel or " hang " just above its bore axis offering a more stable shooting position with large and heavy aiming optics mounted . It has a narrower leg angle due to complaints that the previous version interfered with some night vision systems mounted forward of the telescopic sight . Further versions of accessories are the ITRS tri - rail NV attachement point with an optional extended aluminium bedding block . This extended bedding block also can feature an optional STANAG 2324 Picatinny rail in the bottom of the block .