The BCM 12.5" Carbine Receiver was designed for shooting professionals and responsible civilians with the Mil-Spec features for the demands of their duty.The Bravo Company BCM-URG-12-MCMR10 upper comes with 10" MCMR M-LOK rail and an 12.5" barrel. A gas expansion chamber is machined above the charging handle track, combined with dual vents machined at the rear (each side, above the charging handle latch) help to redirect and vent gas away the shooters face.
- M4 Feed Ramp Barrel Extension
- M4 Feed Ramp Flat Top Receiver
- T-Marked Upper Receivers
- USGI 1/7 Twist Rates
- USGI 5.56 NATO Chambers
- Mil-Spec 11595E - Certified Barrel Steel CMV
- Chrome Lined Bore and Chamber
- Manganese Phosphate Barrel Finish
- HPT High-Pressure Test Barrels
- MPI Magnetic Particle Inspected Barrels
- Carbine Gas System
- MCMR-10 M-LOK Rail
Note: Does NOT come with charging handle.
TEST FIRE DISCLAIMER:
Many of the manufacturers whose products we carry will have a standardized test fire protocol for not only their complete firearms as well as parts such as upper receiver groups and bolt carriers. Because of this test fire protocol, some items will show evidence of the test fire process such as brass and carbon residue on internals or brass markings on case deflectors.
Exactly as advertised 
