Four, specially angled flutes hide nearly 100% muzzle flash, even during full-auto fire, by dissipating gas and retaining unburned powder for increased residual burn. Constructed of the same 8620 bar stock steel used in the manufacture of AR-15/M16 bolts and carriers, then heat-treated to provide a high-strength core and tough, outer shell. Special, helix design helps align exiting barrel gas to improve accuracy with all bullet types. Threaded, deep skirt design provides a clean-looking, direct connection to M14/M1A barrels. Self-tightening, helix design eliminates need for a lock washer. Requires removal of OEM front sight and replacement with Smith Enterprise M14/M1A Gas Cylinder Lock Sight Dovetail if front sight is desired. BFA and sound suppressor compatible for military and law enforcement use.