5.56x45mm NATO Upper Receivers

VLTOR MUR Upper Receiver With Bolt Assist And Shell Deflector - Black Gunkote - Grade B

10.3" Carbine 5.56 Government M-LOK Upper Assembly

8" Pistol 5.56 Government M-LOK Upper Assembly

14.5" 5.56 Phosphate + Chrome Lined Carbine M-LOK M4 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 Heavy Upper Assembly

16" 5.56 Phosphate Carbine M-LOK M4 Upper Assembly

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

Daniel Defense 5.56 NATO 11.5" 1:7 Contract Overrun Upper Receiver w/DD4 7.0 Handguard

12.5 5.56 NATO Government Carbine M-LOK Upper Assembly

16" 5.56 NATO Pencil Midlength Lightweight M-LOK Upper Assembly

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

Aero Precision M4E1-T Threaded 18" 5.56 AR 15 Upper Assembly

15" Aero Precision M4E1 Enhanced Upper Receiver and M-LOK Handguard Combo Gen 2

12" Aero Precision M4E1 Enhanced Upper Receiver and M-LOK Handguard Combo Gen 2

9" Aero Precision M4E1 Enhanced Upper Receiver and M-LOK Handguard Combo Gen 2

7" Aero Precision M4E1 Enhanced Upper Receiver and M-LOK Handguard Combo Gen 2

16" M4 Carbine 1:8 M-LOK Upper Assembly - Black

16" 5.56 Gov / SOCOM Midlength Ultralight M-LOK Upper Assembly

Cross Machine Tool UPUR-1LH Billet Left Handed AR-15 Upper Receiver

16" 5.56 HBAR Fluted Stainless Midlength M-LOK Upper Assembly

16" Billet Slick Side 5.56 Parkerized Mid-Length 1:7 M-LOK AR-15 Complete Upper