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The MIL-STD-1913 rail is commonly called the "Picatinny Rail", in reference to the Picatinny Arsenal in New Jersey. Picatinny Arsenal works as a contracting office for small arms design (they contracted engineers to work on the M4 [ 4 ] ).
It features a 5.5-inch barrel (with an option of a 6.5-inch barrel on the Gen II version), a folding stock, flip-up Midwest Industries back-up iron sights (BUIS) (KRISS Sights on Gen II weapons), a full-length Picatinny rail for mounting various optics/scopes, and either two mode fire selector (single and full-auto) or a three mode fire ...
Flip up non-adjustable iron sights or MIL-STD-1913 rail attached optic The M26-MASS ( Modular Accessory Shotgun System ) is a shotgun configured as an underbarrel ancillary weapon attachment mounted onto the handguard of a service rifle , usually the M16 / M4 family of United States military , essentially making the host weapon a combination gun .
Iron sights are a system of physical alignment markers used as a sighting device to assist the accurate aiming of ranged weapons such as firearms, airguns, crossbows, and bows, or less commonly as a primitive finder sight for optical telescopes. Iron sights, which are typically made of metal, are the earliest and simplest type of sighting device.
The sights are military-style ghost ring and are adjustable in the field using only the rim of a shell. The MIL-STD-1913 Picatinny rail on top of the receiver allows use of both conventional optical sights and night-vision devices, while retaining use of the original iron sights.
Other features include Picatinny rails like the TA648MGO, [12] flip caps, and the ability to be waterproof up to 11 m (36 ft). [13] Although the ACOG is designed for the Picatinny rail of the M16A4 and M4, it can be mounted on the carrying handles of previous models by using a special adapter. [14]
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