The Commando Retro XM177 Flash Moderator is a reproduction of the original 4.5-inch-and-longer Colt moderator fitted to the XM177E1 and XM177E2 Commando carbines during the Vietnam War. At 6 inches long and pin-and-weld installed on a sub-16" barrel, this device brings a short-barreled upper up to the 16" overall barrel length required for non-NFA rifle configurations — giving you a period-correct retro build without a tax stamp.
This is the sound-and-flash-reducing muzzle device that replaced the earlier three-prong "duck bill" hider and defined the look of the XM177 family. The internal geometry is faithful to the original Colt specification: an expansion chamber that tames the muzzle signature of the short-barreled Commando, with the characteristic stepped-cylinder external profile that instantly identifies a Vietnam-era CAR-15 at a glance.
Thread pitch is 1/2x28 for 5.56 applications, and when properly pinned and welded to a 10.5" or 11.5" barrel, the combined assembly yields a legal 16"+ barrel length. This is the correct muzzle device for any XM177E1, XM177E2, GAU-5/A, or CAR-15 Commando clone build where historical accuracy matters.
If you're chasing the retro aesthetic the right way — not a lookalike, but the real profile — this is the part. Order yours today.
Potomac Armory
