Guntec Anti Rotation Pin Set Features The Guntec USA Anti Rotation Pin Set is built around locking cam pins that replace the factory trigger and hammer pins in a standard AR-15 lower receiver. Unlike standard pins which can rotate and walk slightly under the repeated impact of firing these pins are designed to lock in place once installed keeping the trigger group properly retained over thousands of cycles. That added retention helps prevent the pins from backing out or developing play that can affect trigger feel and reliability. Builders assembling a lower from parts or refreshing an older build will find this swap straightforward. Because an Allen key is included in the package there is no need to source a separate tool just to complete the installation. The black finish matches standard AR-15 hardware so the pins blend in visually once installed rather than standing out against the receiver. This kind of small functional upgrade is the sort of detail that serious builders add during assembly rather than waiting to retrofit later. Anyone building or maintaining an AR-15 lower who wants more secure pin retention will benefit from this simple complete pin set. Guntec Anti Rotation Pin Set Specifications Manufacturer: GunTec Color: Black Includes: Allen Key Compatible Hosts: AR-15 Country of Origin: Made in the USA Available At: GrabAGun