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The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge.
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.
The AR-15's "duckbill" flash suppressor had three tines or prongs and was designed to preserve the shooter's night vision by disrupting the flash. Early AR-15's had a 25-round magazine. Later model AR-15s used a 20-round waffle-patterned magazine that was meant to be a lightweight, disposable item.
The first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in .223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines. [21] Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [84]
Case, small arms ammunition – The small arms ammunition case is designed to accommodate three 30-round magazine, cartridge (NSN 1005-00-921-5004) used with the rifle, 5.56 mm, M16A1. It is constructed of nylon duck and webbing with polyester sheet stiffeners in the front, rear and lid of the small arms ammunition case.
The A2 model features a detachable 5-round magazine, top-mounted and adjustable side-mounted Picatinny rails (advertised by Remington as "MARS", or Modular Accessory Rail System), barrel modifications designed to accommodate a sound suppressor, and an improved H-S Precision PST-026 stock with adjustable cheek height and length of pull. Existing ...