AR-15 12.7x42 16" Parkerized Heavy Barrel 1:20 Twist

Faxon Firearms Carbine-Length Button Rifled Pencil Barrel w/Pinned Gas Block 5.56x45mm 10.50", Black

TacFire AR-15 Blow Back .45 ACP 1:16 4140 Chrome Moly Steel Barrel - 5/8x24 - 7.5"

Alexander Arms Tactical 50 Beowulf, 16in. Barrel, 7rd, HG EXP Stock, A2 Grip, & Thread Protector - Black

BALLISTIC ADVANTAGE Premium Series 6MM ARC 16", 5/8x24, 1:7 Mid Length Gas Barrel for AR10

Sons of Liberty Gun Works Precision SPR Barrel 6mm MAX 16", Black - Superior Quality - 16PRECISIONSPR-6MAX

FN AMERICA Barrel AR-15 5.56/223 16" Carbine Length

DIAMONDBACK FIREARMS Barrel 6.5 Creedmoor 24" Rifle Length Black