AR Parts in 5.56x45mm NATO

Green Mountain 5.56 AR-15 Barrel 20" M16 A1 Phosphate

Green Mountain 5.56 AR-15 Barrel 16" M4 Nitride

Green Mountain 5.56 AR-15 Barrel 16" M4 416SS Passivated

Green Mountain 5.56 AR-15 Barrel 16" M4 Crowned Phosphate

Green Mountain 5.56 AR-15 Barrel 16" M4 Phosphate

Green Mountain 5.56 AR-15 Barrel 16" M4 Fluted Phosphate

Green Mountain 5.56 AR-15 Barrel 16" M4 Phosphate

Green Mountain 5.56 AR-15 Barrel 14.7" M4 A1 Phosphate

Green Mountain 5.56 AR-15 Barrel 14.5" M4 Phosphate

Green Mountain 5.56 AR-15 Barrel 10.5" M4 Phosphate

Green Mountain 5.56 AR-15 Barrel 10.3" M4 Phosphate

Cloak Industries MFR 56 Belt-Fed Dual-Feed 16" Quick-Change AR-15 Upper - FDE

Cloak Industries MFR 56 Belt-Fed Dual-Feed 16" Quick-Change AR-15 Upper - Black

Stag Arms 18" 5.56 NATO SPR Fluted Stainless Steel Rifle Length AR-15 Barrel Premium Series 1:8 Twist

Aero Precision 5.56 Carbine M4 AR-15 Barrel - Pinned VG6 Epsilon SL - 14.5" (16" OAL)

10.5" ASAL Free Float Handguard w/ Steel QD Insert

NBS Forward Assist Kit

VLTOR MUR Upper Receiver With Bolt Assist And Shell Deflector - Null Anodize - Grade B

AR-15 1/2 x 28 Slotted Thread Protector

NBS Slick Side Billet Receiver & M-LOK Handguard Combo - 15"

Slick Side Billet Upper Receiver - OD Green

4.5" 5.56 Nato Micro Pistol Medium 1:5 4150 Black Nitride AR-15 Barrel

10.3 Carbine 5.56 Government M-LOK Upper Assembly

8 Pistol 5.56 Government M-LOK Upper Assembly