The A2 Upper Receiver has a 300 – 800 meter rear sight system (with 1 M.o.A. Elevation and ˝ M.o.A. Windage adjustments). Bushmaster M16 A2 Rifles feature a narrow profile A2 Government type barrel (.670" diam. to .610 diam. under the handguards – accepts the M203 Grenade Launcher) for reduced weight.
Barrels are Hard Chrome lined in both Bore and Chamber to aid in removing powder residue and copper fouling, to increase muzzle velocity, and ease chambering and extraction – effectively doubling barrel life if regular maintenance procedures are observed. An A2 “Birdcage” type Flash Suppressor with closed bottom is fitted to compensate for muzzle climb and reduce dust signature when firing from the prone position. The barrel, and all critical steel components of the rifle, are manganese phosphate coated for protection against corrosion and rust.
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