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The Brownells M16A1 Buttstock Screw is the perfect solution for early AR-15 / M16A1 buttstocks that require a shorter screw than the more common M16A2 screw. This screw is specifically designed for use on the original AR-15, M16, M16A1, SP1, and other similar rifles utilizing the shorter A1 rifle buttstock. The screw is precision-machined and made of hardened steel with a tough, matte black phosphate finish. Its center hole allows airflow during firing and water drainage if submerged.

Most importantly, the Brownells M16A1 Buttstock Screw is short enough that it won’t protrude into the buffer tube and interfere with movement of the buffer, eliminating the need for a spacer between the buttstock and buffer tube (receiver extension). However, please note that this screw is NOT compatible with later, longer A2 buttstocks.

Small in size, yet indispensable in importance, the Brownells M16A1 Buttstock Screw is a must-have for anyone looking to install a surplus or reproduction A1-pattern buttstock properly on their rifle.