SIG SAUER Barrel/Gas Block Assy MCX 300 Blk 6.75" Rattler LT

Ballistic Advantage Performance Barrel 5.56x45mm 13.70", Black - Compact and Efficient Barrel - BABL556036F

ONE HORSE 16" Pistol Gas SOCOM Barrel 300 Blackout 1:7

AERO PRECISION M4E1 Threaded Complete Upper 16" 5.56 Barrel w/ 15" M-LOK ATLAS R-ONE Handguard - BLK

Faxon Firearms Mid-Length Button Rifled Gunner Barrel 5.56x45mm 16", Black