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Brownells Xm177E2 Upper Receiver, 11.5'', 1-12 Twist, Black
$804.99
$806.59
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$1.60
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The Brownells XM177E2 upper receiver in 11.5" with 1-12 twist is purpose-built for shooters looking to assemble a retro-correct AR carbine inspired by Vietnam-era configurations. This is a complete upper assembly—barrel, bolt carrier group, handguards, sights, and all the proper details included—so you're not hunting through parts lists to make it work. The 11.5" barrel with 1-12 twist rate is the right choice if you're running standard 55-grain rounds; it handles the velocity and ballistics of lighter bullets cleanly. Pair it with a lower receiver and buffer system, and you've got a genuine XM177E2 replica that respects the original design without the legal hassle.
What makes this upper genuinely correct is the attention to period-accurate hardware. The XM177E2 moderator flash hider—featuring the distinctive radial porting and grenade ring—sits atop the barrel, managing muzzle signature just like the originals. The M16A1-style upper receiver omits the shell deflector, matching the original profile, while the teardrop forward assist and A1 rear aperture sight bring back that classic manual-of-arms feel. Black carbine handguards with integral heatshields complete the look and functionality.
Inside, you're getting mil-spec manganese phosphate finishing on the bolt carrier group with a 9310 bolt—the kind of durable, no-frills parts that have proven themselves in hard use. Chrome-lined bore and chamber mean longevity and easier cleaning. The tapered slip ring and proper ejection port cover are details most builders miss; Brownells got them right. This is the upper for someone who wants to build something that looks, handles, and shoots like the real thing—not a parts-bin hodgepodge.
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