R91 dating

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The large gas piston and tapered cartridge case design allow the gun to endure large amounts of foreign matter and fouling without failing to cycle.The bore and chamber, as well as the gas piston and the interior of the gas cylinder, are chromium-plated, dramatically increasing the life of these parts by resisting corrosion and wear.As each bullet travels through the barrel, a portion of the gases expanding behind it is diverted into the gas tube above the barrel, where it impacts the gas piston.The piston, in turn, is driven backward, pushing the bolt carrier, which causes the bolt to move backwards, ejecting the spent round, and chambering a new round when the recoil spring pushes it back.While other models and variants were developed, the R91's combination of ruggedness, firepower, and low manufacturing costs resulted in its adoption as an assault rifle of the National Guard and issuance to troops on the Anchorage front.The number of working units is particularly high in the Capital Wasteland, as the National Guard units deployed there used it widely.An assault rifle is a selective fire rifle that uses an intermediate cartridge and a detachable magazine.Assault rifles are the standard infantry weapons in most modern armies.

Employing a roller delayed blowback system, it is a very sturdy design, with simple iron sights that consist of a rotary rear drum and hooded front post, a fire selector switch with three settings (safe, fully automatic fire, single shot), and a flash suppressor. The R91 was manufactured by Stent as part of its R series, superseding the manufacturer's own M series of combat assault rifles in the early 21st century.It has a reflex scope, fires 5.56mm with a 20-round magazine.As a heavy-duty automatic weapon, the Ruger AC556F was designed to for rough handling in the militaristic environments of combat zones or in pulling security duties.Its reliability, ruggedness and accuracy have earned it the reputation of being the best assault rifle ever made.is a military assault rifle from the AK series originating from the USSR.

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