Helical Flute Dissipate Gas, Hide Muzzle Flash
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. Rigid, unique Vortex helical flutes hide significant muzzle flash and is made especially for use on the 7.62 NATO (Metric) FAL. Permits installation of .30 Direct Connect sound suppressors.
Big Book Catalog, Issue:66, Page:172
Law Enforcement / Police Store, Issue:08, Page:028
SPECS: 8620 steel. Black, phosphate finish. 9⁄16" - 24 tpi LH thread. 2-7⁄16" (6.1cm) long, .860” (2.1cm) dia. 3.1 oz. (87g) weight.