**NFA short barrel rules do apply, please check with your local State laws for legal ownership**
The M-15A4 Law Enforcement Carbine complete upper assembly with A2 front sight features a chrome lined barrel with M-203 step down. The MIL-STD 1913 rail on the upper receiver allows rapid and repeatable interchange of removable iron or scope sights.
Each Armalite complete upper assembly includes a forged upper receiver assembly, barrel assembly, bolt carrier group and charging handle assembly. All complete upper assemblies are test fired as complete rifles before shipping.
.750 at the journal (under the gas block)
Model: M-15 11.5" law enforcement carbine complete upper half assembly
Caliber: 5.56X45 mm / .223
Barrel: 11.5" double lapped, chrome lined\chrome moly Vanadium MIL-B-11595-E, with M203 step down barrel, threaded 1/2x28
Rifling Twist: 1:7" RH
Muzzle Device: Flash suppressor
Front Sight Base: A2
Upper Receiver: Forged, flat-top with MIL-STD 1913 rail & laser engraved rail numbering, 7075-T6 aluminum
Finish: Anodized aluminum upper receiver, manganese phosphated steel barrel