AR Parts in 5.56x45mm NATO

Aero Precision AR-15 5.56/.223 Bolt Carrier Group w/ Carrier Grooves - Black Nitride

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

16 5.56 NATO Pencil Midlength Lightweight M-LOK Upper Assembly

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

Armaspec Rifter Linear Muzzle Brake 5.56/.223 - 1/2-28 - No Shield

NBS AR-15 Stripped Upper

SLR Rifleworks Premium Bolt Carrier Group Black Nitride - 556

SLR Rifleworks Billet Upper SLR 556

BCA M16 Profile 5.56 NATO Complete Bolt Carrier Group - Black Nitride

LMT Full-Auto Enhanced 5.56 Bolt Carrier

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

Faxon ARAK-21 16" 5.56 Ambidextrous Piston Complete Upper

Mimtac F3X 45/90 AR-15 Ambidextrous Safety Selector - Red

Mimtac F3X 45/90 AR-15 Ambidextrous Safety Selector - FDE

Mimtac F3X 45/90 AR-15 Ambidextrous Safety Selector - Grey

Mimtac F3X 45/90 AR-15 Ambidextrous Safety Selector - Black

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

Ballistic Advantage 14.5" 5.56 M4 Profile Carbine AR-15 Barrel w/ FSB Circular Cap and Delta Ring Assembly 1:7 Twist

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

NBS AR-15 .223/5.56 A2 Style Mil-Spec Buffer / Receiver Extension Kit

LMT Defense 5.56 F-A BOLT CARRIER GROUP

Microbest C158 HPT/MPI 5.56 Bolt Carrier Group - Black Nitride

Microbest C158 HPT/MPI 5.56 Bolt Carrier Group - Chrome

Microbest Mil-Spec C158 HPT/MPI 5.56 Bolt Carrier Group - Phosphate/Chrome-Lined