BCM BCM4 5.56 NATO AR-15 Semi-Auto Rifle, 16.5 in Barrel, MCMR-13 M-LOK Handguard, Custom B5 Stock
This BCM BCM4 is a USA-made AR-15 in 5.56 NATO that has been custom-configured with a B5 Systems collapsible precision-style stock with adjustable cheekpiece, an open-prong flash hider, a textured beavertail pistol grip, and a single-stage curved trigger with a nickel-colored shoe. It uses a BCM MCMR-13 free-float M-LOK handguard with an uninterrupted MIL-STD-1913 top rail and includes a 30-round PMAG and a rail-mounted optic adapter plate installed.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: The pin-and-weld at the muzzle shows a rough exterior finish. Mild wear is present.
What’s Included
- 1x 30-round Magpul PMAG Gen M3 polymer AR-15 magazine
- Rail-mounted optic adapter plate (installed)
The lower receiver is marked "BCM Rifle Company" with model "BCM4" and "CAL MULTI," and the selector is marked "SAFE" and "SEMI." The upper carries the BCM star logo, a BCM-marked ejection-port cover, forward assist, and shell deflector. Country of origin is the USA.
Configured for 5.56 NATO, this rifle has a 16.5-inch barrel with a threaded muzzle and an open-prong flash hider. The BCM MCMR-13 aluminum free-float handguard features M-LOK slots and an uninterrupted MIL-STD-1913 top rail that continues across the upper receiver. A small accessory mounting plate is installed on the 12 o'clock rail near the receiver, and the top rail length is 13.4 inches.
The stock is a B5 Systems collapsible precision-style unit with an adjustable cheekpiece, an anti-rotation QD sling socket, and a rubberized buttpad. Length of pull measures 13.75 inches. The pistol grip is a textured polymer beavertail design (non-BCM).
This semi-automatic, direct-impingement rifle uses a manual safety and a single-stage curved trigger with a nickel-colored shoe (aftermarket). Capacity is 30+1 with the included 30-round magazine.