The Fortis Lightweight Enhanced AR15 End Plate features the innovative K1 system with a tapered castle nut that creates an ultra-precise seal without requiring staking.Fortis Lightweight Enhanced AR15 End Plate (Black)K1 System - tapered castle nut seals automaticallyNo staking required - eliminates ratcheting and backing outQuick Detach Socket for sling attachment7075 T6 Aircraft Grade Aluminum constructionLightweight design for reduced weightNo set screws or ratcheting system neededThis precision-engineered end plate provides a reliable failure-proof installation solution for AR15 builds where secure attachment and quick detach capability are essential.