The Presma bufferless stock adapter replaces your buffer tube assembly and lets you add a stock directly to your AR-15 or AR-10 upper. It is made for uppers where everything is contained in the upper, so no buffer tube is needed behind the receiver. Fit: AR-15 and AR-10 builds that use an upper with the recoil system fully contained in the upper. It is compatible with most folding buttstocks and stabilizers that mount to a Picatinny interface. It is not for standard direct-impingement uppers that need a buffer and buffer tube to cycle. Finish: High-quality aluminum construction, anodized black. U.S. Patent Pending, Application Number 18385489 Features: 3-slot Picatinny rail end cap Easy tightening system Hole for a QR sling swivel (sling swivel not included) Aluminum construction, anodized black Confirm your upper contains its own recoil system before ordering, and verify your stock or stabilizer uses a Picatinny mount. Re-check the tightening system after your first range session.