AR Parts in 5.56x45mm NATO

10.5" 5.56 Stainless Steel Carbine 1:7 Medium Barrel

8.5" 1:7 5.56 Stainless Steel M4 Pistol Barrel

NBS AR-15 .223/5.56 Bolt Carrier Group - Phosphate

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 .223/5.56 C158 Bolt Carrier Group - Black Nitride

NBS Sport 7.5 5.56 DRP Pistol M-LOK Upper Assembly

16" 5.56 HBAR 1:9 Twist Black Nitride Carbine Barrel

10.5" 5.56 NATO 1:7 Twist 4150V Black Nitride Carbine Barrel

NBS AR-15/M16 Helical Gas Ring

NBS AR-15 9310 Bolt Assembly - Black Nitride

NBS AR-15 9310 Bolt Assembly - Nickel Boron

NBS Lightweight .223/5.56 Bolt Carrier Group - Nickel Boron

AO Precision C158 SP/HPT/MPI 5.56 Bolt Carrier Group - Black Nitride

20" 5.56 Chrome-Lined Lightweight Contour 1:9 Rifle Length Barrel w/ FSB Pho

AO Precision True Mil-Spec SP/HPT/MPI 5.56 Bolt Carrier Group

20" 5.56 Lightweight Contour 1:9 Rifle Length Barrel w/ FSB Phosphate

NBS AR-15 Assembled Upper Receiver

Premium Series 10.5" 5.56 NATO 1:7 Black Nitride Carbine Length Barrel

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

AR-15 16" Black Nitride 4150 Steel SOCOM Barrel 5.56 NATO Mid Length Gas 1:7 Twist

20" Black Nitride 4150 Steel Government Barrel 5.56 NATO Rifle Length Gas 1:7 Twist

10.5" 416R Stainless Steel M4 Contour Barrel 5.56 NATO Carbine Length Gas 1:8 Twist

16" 5.56 Parkerized 1:9 Twist Carbine Length Barrel