5.56x45mm NATO Upper Receivers

BCM 16" 5.56 NATO 1:7 Enhanced Light Weight Barreled Upper - 15" M-LOK MCMR Rail

Centurion Arms CM4 5.56 AR-15 Forged Upper Receiver

Lantac N15 Raven Billet Receiver Set

Stag Arms A3 Flattop Left-Handed Upper Receiver Assembly - FDE

NBS 16" Gov Mid M-LOK Upper Assembly - Magpul OD Green

Cloak Industries MFR 56 Belt-Fed Dual-Feed 16" Quick-Change AR-15 Upper - FDE

Cloak Industries MFR 56 Belt-Fed Dual-Feed 16" Quick-Change AR-15 Upper - Black

VLTOR MUR Upper Receiver With Bolt Assist And Shell Deflector - Null Anodize - Grade B

NBS Slick Side Billet Receiver & M-LOK Handguard Combo - 15"

Slick Side Billet Upper Receiver - OD Green

10.3 Carbine 5.56 Government M-LOK Upper Assembly

8 Pistol 5.56 Government M-LOK Upper Assembly

8" 5.56 Government Pistol M-LOK Upper Assembly

16 5.56 Phosphate Midlength M-LOK Lightweight Complete Upper

16 5.56 Phosphate Midlength M-LOK Lightweight Upper Assembly

16 5.56 Phosphate Carbine M-LOK Government Upper Assembly

16 5.56 Phosphate Carbine M-LOK M4 Upper Assembly

14.5" 5.56 NATO M4A1 SOCOM Carbine Complete Upper w/ FSB

16 5.56 NATO Pencil Midlength Lightweight M-LOK Upper Assembly

10.5 Slick Side Billet 5.56 Nitride Carbine M-LOK Upper Assembly

NBS AR-15 Stripped Upper

SLR Rifleworks Billet Upper SLR 556

LMT Defense 16" 5.56 Chrome-Lined 1:7 Twist Barreled Upper Receiver

Faxon ARAK-21 16" 5.56 Ambidextrous Piston Complete Upper