Proudly Designed and Made in USA15" Single Rail, Super Slim, Free-floating Handguard with Proprietary Attachment Design and Extremely Compact ProfileSuper Lightweight with Rail at 12 Oclock Position Forms a Continuous Picatinny Top SectionIncludes 3 User Detachable 2-slot Rail Sections for 3, 6, and 9 Oclock PositionsIntegral Anti-rotation Tab for Rock-solid LockingAccommodates Low-profile Gas BlockErgonomic Slim Tubular Profile for Most Positive HandlingNOTE: This rail system is designed to fit with standard AR15 gas tubes. The compatibility with any special piston system is not guaranteed. Also, the rail system works with standard AR15 upper receivers. It may not be compatible with any re-designed, oversized upper receiver