Web Arms Compact Tacticals and M4 Rifles are offered in semi-auto and Select Fire configurations. The semi-auto selectable positions are safe and semi-auto, while the Select Fire model has safe, semi-auto and Tri-burst, or safe, semi-auto and full-auto. All Compact Tacticals and M4 Rifles have detachable carry handles for flat tops that have a fixed front sight, and all barrels come with a threaded flash suppressor or compensator. Officers have a choice of compacts with 6 1/2- or 11-inch barrels, 16- or 20-inch A2 or A3 style and a four-position collapsible stock or fixed.The upper and lower receivers are made from forged high-strength aircraft aluminum alloy, tempered to T6 condition, hard coat anodized per Mil-A-8625, and will accept all standard AR-15/M-16 magazines, trigger group/hammer parts and buttstock.