5.56x45mm NATO Upper Receivers

20 5.56 Phosphate Rifle M-LOK Government Upper Assembly

Aero Precision M4E1 Enhanced Upper Receiver and Quantum M-LOK Handguard Combo - Anodized - 15"

Aero Precision M4E1 Enhanced Upper Receiver and Quantum M-LOK Handguard Combo - Anodized - 12"

Aero Precision M4E1 Enhanced Upper Receiver and Quantum M-LOK Handguard Combo - Anodized - 9"

Aero Precision M4E1 Enhanced Upper Receiver and Quantum M-LOK Handguard Combo - Anodized - 7"

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

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

NBS AR-15 Stripped Upper

NBS 16" 5.56 M4 Carbine 1:8 M-LOK Upper Assembly - Black

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

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

LMT MRP-L M-LOK AR-15 Upper Receiver - 9.25"

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

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

LMT 10.5" 5.56 Chrome Lined 1:7 Barreled Upper Receiver

NBS 5 5.56 Micro 1:5 M-LOK Upper Assembly

NBS 14.5" Mid-Length 5.56 NATO 1:7 Complete Upper w/ Front Sight Base

Aero Precision M4E1 Builder Set w/ 9.3" ATLAS S-ONE M-LOK Handguard - Multi Terrain Camo

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

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

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

War Dog Industries Skeletonized Upper Receiver - Black

Ar-15 A1 Complete Upper Receiver 5.56 Piston - A1 T91 Complete Upper Receiver 5.56 Piston

Wolf Performance A1 Complete Upper 12.5\" 5.56 NATO 1:7 Piston Driven