Based on the combat-proven Vortex® 5.56mm G6A1 system, the definitive development of the patented Vortex® design now features a 40% increase in structural rigidity. The new G6A2 model features our patented 15-degree helix, guaranteeing a complete propellant burn and negligible flash, unlike the standard issue closed-end “bird cage” unit or competing straight-flute designs. Right hand helical flutes will not loosen under sustained fire. The flute configuration is 40% stronger due to greater mass. The aligning of exiting gases helps to improve overall accuracy. The G6A2 also serves as a quick-connecting interface for our new M4DC CQB Sound and Flash Suppressor. SEI suppressors are only available to USG/LE and FMS customers via direct factory sales. The highest degree of flash suppression is gained using M-193, SS-109 (M855), and MK 262 service ammunition.