BRN-4(R) UPPER RECEIVER ASSEMBLIES WITH CHROME LINED BARRELS

Brownells BRN-4 10.4 Inch Medium Contour Chrome Lined Barrel 5.56x45 1-7 Twist

Brownells BRN-4 16 Inch Barrel Medium Chrome Lined Phosphate 5.56x45 1-7 Twist

GUNTEC AR15 SLABSIDE STRIPPED BILLET UPPER RECEIVER BLACK

Brownells BRN-4 13.7'' Barrel Medium Chrome Lined Phosphate 5.56x45 1-7 Twist

AERO PRECISION M4E1-T 5.56 NATO 11.5" Complete Upper Receiver | Black

Brownells BRN-4 Bolt Assembly 5.56 x 45 Compatible

Wraithworks Billet Slick Side AR-15 Upper Receiver - Black | No Forward Assist or Brass Deflector