This 9mm chambered 5.5 inch straight profile barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and 1/2-28 x .400 full profile threads.
Designed to work with both Colt/RR and Glock style AR builds
Compatible with EPC upper receivers, as well as standard mil-spec upper receivers
9mm on an AR15 platform operates by blowback and does not need a gas block or gas tube
Threaded 1/2x28 to give you versatility when choosing a muzzle device
Integrated barrel extension
Since the "barrel extension" is an integral part of the barrel, the length stated is the true overall length. For example, an 11" 9mm barrel has the same outer dimensions/length as a 10.5" 5.56 barrel.
IMPORTANT: A standard 1/2x28 flash hider will not have enough clearance for a 9mm round to pass. Before installing a muzzle device, ensure a 9mm round will drop freely through the muzzle device bore.