This is the Retro XM177E2 clone-correct complete upper receiver in 5.56 NATO — the 10" carbine upper that defined Vietnam-era SOG, MACV, and early SEAL weapons. Every detail on this upper has been built to match the original Colt XM177E2 (Model 629) specification: slick-side forged upper receiver with no forward assist and no dust cover, 10" pencil-profile barrel with the correct XM177E2 gas port location, pinned triangular front sight base, and the unmistakable 4.5" XM177E2 moderator permanently pinned and welded to reach the 16" legal overall barrel length.
Chambered in 5.56 NATO (will safely fire .223 Remington), the barrel is 4150 CMV steel, phosphated, with a 1:12 twist that replicates the original 55gr M193 ball performance. Shipped complete with bolt carrier group, charging handle, and the correct XM177E2 triangular handguards. Pair it with a Colt retro slickside A1 lower and an A1 stock, and you've got a SOG-era clone that belongs in a museum — or on the range.
XM177E2 retro uppers built to this level of accuracy are rare. We don't cut corners on clone-correct retro builds.
Order yours today and own a piece of Special Forces history.
Potomac Armory
Colt
Daniel Defense