"The silencer-optimized Raptor-SD(TM) features a ported shaft designed to redirect gasses down and forward, away from the shooter's face when shooting suppressed. Its ambidextrous design allows rapid palm ""blading"" or finger-thumb charging of the weapon, ensuring the motion is fluid and fast from either strong or support side. The Raptor-SD is compatible with most AR15/M16-pattern rifles. Designed & Manufactured in the USA Machined from 7075-T6 aluminum Milspec Type 3 Hard Coat Anodized Finish w/ Cerakote Colored Grip Palmetto State Armory is the leading supplier of Modern Sporting Rifle parts and accessories at the best prices!"