End Plate Tech Ten Tactical Retail Packaged: - T10 M16/M4/AR15 S.A.G. (Spring-Assisted Guide) - If you've ever installed or removed a receiver end plate on a rifle you know how annoying it can be. Cautiously holding the detent spring in place with a pin or razor desperately hoping it doesn't pop out and fly across the room. We got sick and tired of that so we developed a solution. The patent-pending T10 M16/M4/AR15 Receiver End Plate ensures your detent spring stays secure during installation and/or removal. The end plate is almost identical to others on the market with one exception: a small perfectly sized hole located on the inward face to hold the detent spring in place. Never lose a spring (or your sanity) again! - Standard M16/M4/AR15 design - Magnesium phosphate coating - Firmly secures detent spring for easy installation and removal - Manufactured with pride in Connecticut