The TRG-21 action was designed for a maximum cartridge length of 75В mm (2.95В in). 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 19В mm (0.75В in) diameter, displaying a locking surface of 75В mm 2 (0.116В in 2). (RiihimГ¤ki, Finland) introduced the TRG-21 precision rifle as a sniper rifle model chambered in. 338 Lapua Magnum used by an Italian soldierД®ven though the TRG-21 obtained its origins from the successful Sako TR-6 target rifle and 1984-1986 development work for the hardly produced Valmet Sniper M86 rifle by the former Finnish state firearms company Valmet which merged with Sako, the 4.7В kg (10В lb 6 oz) TRG-21 was designed as a result of a thorough study of sniper requirements. It was designed as a user configurable multi calibre modular system responding to evolving market demands and does not share its receiver and other technical features with the rest of the TRG line. In October 2011, Sako introduced the Sako TRG M10 Sniper Weapon System. 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. Generally TRGs are outfitted with a Zeiss or Schmidt & Bender PM II telescopic sight with fixed power of magnification or with variable magnification. The Sako factory TRG muzzle brakes vent sideways and are detachable. The sniper rifles are normally fitted with muzzle brakes to reduce recoil, jump and flash. They are available with olive drab green, desert tan/coyote brown, dark earth or black stocks, and are also available with a folding stock. 308 Winchester ( 7.62Г—51mm NATO) sized cartridges, while the TRG-41 and TRG-42 are designed to fire more powerful and dimensionally larger. The TRG-21 and TRG-22 are designed to fire standard. The Sako TRG is a bolt-action sniper rifle line designed and manufactured by the Finnish firearms manufacturer, SAKO of RiihimГ¤ki. 338 Lapua Magnum)ДҐ-round detachable box magazine (.338 Lapua Magnum)Д§-round detachable box magazine (.300 Winchester Magnum)ДЎ0-round detachable box magazine (.308 Winchester)ДЄperture rear (with flip-up open tritium night/combat sight) day or night optics

Electro tek user's manual