BARRELS: Other manufacturers use a variety of barrel steels, but, Military Specifications call for the best grade Chrome Moly Vanadium Steel - and Bushmaster follows Mil. Spec.!
Their match heavy barrels are full diameter from end to end while other makers taper their barrels to standard diameter under the Handguards in order to attach the M203 grenade launcher. This defeats the purpose of a heavy barreled gun. The heavy design improves heat dissipation and decreases barrel whip in extended fire situations. If you intend to attach an M203, they can supply the necessary barrel configuration.
CHROME LINED BORE & CHAMBER: The Govt. Spec. chrome lined bore and chamber completely protects against corrosion because chrome is more than twice as hard as the barrel steel - effectively doubling the barrel's life. The lubricity of chrome (i.e. it's properties of slipperiness) reduces friction, increases velocity, and aids in chambering and ejection to help your weapon function better - longer. These barrels will not rust or corrode and they offer the longest barrel life in the industry.
GOVT. SPEC. FORGED FRONT SITE: This front sight base is not a casting - forgings are far superior in tensile strength. They won't crack and disable your weapon if you bump it against something!
GOVT. SPEC. MANGANESE PHOSPHATE FINISH: Bushmaster utilizes the government's latest recommended protective finish for steel in our manufacturing. This finish protects against corrosion and rust, and produces the correct matte black military surface color. BUSHMASTER DOES NOT PAINT THEIR PARTS like some other manufacturers.
Expect only genuine Mil. Spec. from Bushmaster - they are a U. S. Defense Contractor!
TWIST RATE: They rifle their barrels 1 turn in 9" of length. The Gov't. does their barrels 1 in 7" and with the powerful SS109 ammo, some barrels are burning out prematurely - especially under full-auto fire. Bushmaster has found that the 1 in 9" twist gives the best results using either SS109 - 63 grain or standard M193 - 55 grain ammo, and will stabilize most bullets up to 72 grains.
E2 RECEIVER FEATURES:
They machine their receivers to utilize two standard push pins for simple "tool-less" take down. This is what the military receives (why carry 2 screwdrivers in the field?).
Into the forging, Bushmaster incorporates a brass deflector for ejected shell control, and raised areas around the mag. catch button to prevent accidental release of the magazine - all per military specification.
A2 Dual Aperture type rear sight - with adjusting knobs for both windage AND elevation.
Flip-up Field and Target Apertures - for both short and long ranges.
1/2" at 100 yards increment of adjustment (versus old style one inch increments) and the new A2 rear sight eliminates the need for a sight tool.
Black Thermoplastic Pistol Grip has finger groove and serrated back for solid grasp.
A2 length stock - which is 5/8" longer for a correct trigger pull length of 13.5 inches.
Note- the plastic cases provided with most Bushmasters are not guaranteed to arrive un-broken. Broken cases can be replaced by the factory only.
