5.56x45mm NATO Upper Receivers

M16A1 C7 Stripped Upper Receiver w/ Brass Deflector - No Feedramps

Centurion Arms AR-15 CM4 Forged 5.56 Stripped Thermal Fit Upper Receiver

NBS 16 5.56 NATO Midlength Nitride M-LOK Rifle Kit

BCM Standard Midlength Enhanced Light Weight Fluted Upper Receiver Group - MCMR-15 Handguard - 16"

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

Aero Precision M4E1 Threaded Assembled Upper Receiver and 9" ATLAS R-ONE M-LOK Handguard Combo - Anodized Black

NBS Premium Series 11.5 5.56 Upper Assembly w/ Geissele MK4 Handguard

NBS Premium Series 16 5.56 Upper Assembly w/ Rosco Barrel and Geissele MK14 Handguard

NBS 8.5 Pistol 5.56 Stainless M-LOK Upper Assembly

NBS 7.5 5.56 DRP Pistol M-LOK Upper Assembly

NBS 10.5" Carbine M4 M-LOK 5.56 NATO 1:7 Upper Assembly

NBS Sport 7.5 5.56 DRP Pistol M-LOK Upper Assembly

NBS AR-15 Assembled Upper Receiver

NBS 16" Gov Mid M-LOK Upper Assembly - Magpul FDE

NBS 7.5" Slick Side Billet 5.56 Nitride Pistol M-LOK Upper Assembly

NBS Premium Series 14.5" 5.56 NATO Upper Assembly w/ CMT UHPR Mod 2 HDX

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

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

NBS 16" Carbine 5.56 NATO 1:7 Complete Upper

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

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

BCM 5.56 NATO Midlength Lightweight Fluted Barreled Upper - MCMR-13 - 16"

BCM Standard 5.56 NATO Upper Receiver Group - MCMR-15 Handguard - 20"