Primary Weapons Systems Ratchet Lock Castle Nut and End Plate Set Features The Primary Weapons Systems Ratchet Lock Castle Nut and End Plate Set uses a ratcheting mechanism in place of traditional staking to keep the castle nut locked against the receiver extension. This design holds tension reliably under recoil while still allowing the nut to be removed and reinstalled without the grinding or re-staking that a conventional setup requires. Built from steel and finished in black the set is compatible with both mil-spec and commercial buffer tubes making it a drop-in upgrade regardless of which tube spec a build uses. It fits AR-15 and AR-308 pattern rifles alike covering the two most common buffer tube platforms. The end plate integrates a QD sling mount giving builders a sling attachment point without needing a separate QD end plate or swivel adapter. This is a straightforward upgrade for anyone assembling a rifle from parts or refreshing an existing build s buffer tube hardware. Easy installation means the set can be swapped onto an existing tube with ordinary armorer s tools. For builders who want the security of a locked castle nut and a QD sling point without the hassle of staking this set is a practical affordable addition. Primary Weapons Systems Ratchet Lock Castle Nut and End Plate Set Specifications Manufacturer: Primary Weapons Systems Model: Ratchet Lock Castle Nut and End Plate Set Color: Black Material: Steel Compatible Hosts: AR-15 AR-308 Mil-Spec and Commercial Buffer Tubes Features: QD Sling Mount Available At: GrabAGun