BCM 14.5 Std ELW-F  MCMR 13 MLOK W/Pinned BCM Comp MOD 3 (16 OAL).

Features:

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
ELW-F Profiled Barrel
HPT (High Pressure Test) Barrels
MPI (Magnetic Particle Inspected) Barrels
Barrel Length: 14.5
Rail: MCMR 13"