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A rail system mounted on top of a SIG SG 550 A dovetail rail on a rifle receiver for mounting a sight. A rail integration system (RIS; also called a rail accessory system (RAS), rail interface system, rail system, mount, base, gun rail, or simply a rail [1]) is a generic term for any standardized attachment system for mounting firearm accessories via bar-like straight brackets (i.e. "rails ...
M26-MASS Stand-alone configuration. Note that the "rear sight" is just the ring used to mount it around a rifle's barrel (as visible in the other pictures.) Caliber: 12 gauge; Operation: Manual Straight pull bolt-action. Capacity: 3 or 5 round detachable box magazine. Ammunition: 2.75 (70mm) and 3 in (76mm) lethal, non-lethal and breaching rounds.
Non-static weapon mounts, such as bipods, monopods, and shooting sticks, are also regularly used to aid and improve stability and reduce operator fatigue. Shooting bags are also commonly used to help stabilize the rifle or to provide an adjustable base.
[11] [12] The AS Val can mount the PSO-1 telescopic sight of the SVD rifle, or the 1PN52-1 night sight. Iron sights are also provided to both rifles. [4] [18] According to Janes, the VSS telescopic sight has a length of 375 mm (14.8 in) and weights 580 g (20 oz), while the night sight has a length of 340 mm (13 in) and weights 2.1 kg (4.6 lb). [11]
The rifle features adjustable iron sights with a sliding tangent rear sight, graduated from 100 to 1,200 m (109 to 1,312 yd) in 100 m (109 yd) increments. The iron sights can be used with or without the standard-issue optical sight in place. This is possible because the scope mount does not block the area between the front and rear sights.
The M21 sniper weapon system (SWS) in the US Army is a national match grade M14 rifle, selected for accuracy, and renamed the M21 rifle. [7] The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle. [8] It is chambered for the 7.62×51mm NATO cartridge.
A third safety type, a pistol grip safety similar to the later-developed SPAS-15, is known to have been developed by Franchi for the SPAS-12, however, the pistol grip safety was not offered for sale to the general public. A B-Square rail mount for optics was available for a short time in the 1990s as an aftermarket accessory.
Comparison of milliradian (mil) and minute of arc (moa).. Since adjusting the point of impact to match the point of aim is relatively simple with any type of adjustable sights, the primary goal of accurizing is to increase the precision of the firearm, which is generally measured by looking at the dispersion of a number of shots fired at the same point of aim.