The XM177E2 upper receivers a redesigned for enthusiasts seeking to replicate popular carbine configurations in their retro builds. The muzzle is equipped with a classic XM177E2 moderator-inspired flash hider, featuring radial ports. Unlike the original XM177 muzzle device, which functioned as a suppressor, this component serves as a flash hider and is affixed to a lightweight 11-1/2 inches barrel. For optimal performance with 62 grain or heavier ammunition, select a 1:7 twist rate. The front sight base is not F-marked, ensuring alignment of the round, tapered front sight post with the carry handle rear sight. The black carbine handguards a redesigned to closely resemble the original CAR handguards. These barrel assemblies include a tapered slip ring, consistent with the design of carbines of this type. The upper receiver is equipped with an appropriate ejection-port cover, featuring a flat external bump, distinct from standard A2 models. The receiver itself is styled after the M16A1, incorporating a forward assist but lacking a shell deflector. The rear sight is the standard A1 aperture, adjustable with a cartridge or tool. The included Bolt carrier group is a manganese phosphate mil-spec BCG with a chrome-lined interior, adhering to proper specifications.

M16A1 upper receiver lacking shell deflector
Barrel with a length of 11-1/2 inches, chambered for 5.56x45mm ammunition
1:7 twist rate with chrome-lined bore and chamber
Ejection port cover for M16A1
Teardrop forward assist
A1 rear sight component assembly
Subjected to magnetic particle inspection and high-pressure testing
Black polymer handguards equipped with integrated heat shields for carbine models
Manganese phosphate mil-spec Bolt carrier group featuring a carpenter 158 bolt

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Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.