The Primary Weapons 4BTRLPB-1F Castle Nut Ratchet Lock is a versatile and innovative upgrade for any rifle build. Designed by the renowned firearms manufacturer Primary Weapons Systems, this castle nut and end plate set offers a quick and easy solution for securing your buffer tube. Featuring a ratchet lock mechanism, the castle nut eliminates the need for traditional staking, providing a secure and reliable connection to your commercial or commercial-style buffer tube. The end plate includes a convenient QD (quick-detach) mount, allowing you to easily attach slings or other accessories. Easy installation with any buffer tube Ratchet lock mechanism for a secure connection Integrated QD mount for sling attachment This compact and lightweight castle nut and end plate set is the perfect choice for those looking to upgrade their rifle's rear assembly. Whether you're building a new rifle or enhancing an existing one, the Primary Weapons 4BTRLPB-1F Castle Nut Ratchet Lock is a must-have addition to your firearm.