Strike Industries Picatinny Stock Adapter - Anodized Black - The Strike AR Picatinny Stock Adapter provides a simple and cost-effective solution for converting compatible AR-15 and AR-10 lower receivers to accept 1913 Picatinny interface stocks or stabilizers. Designed for firearm platforms that utilize self-contained operating systems and do not require a traditional buffer tube assembly, this adapter allows users to replace the standard receiver extension with a versatile Picatinny mounting interface. Precision-machined to thread directly into the standard AR rear receiver thread pattern (1 3/16x16 HSS right-hand thread), the adapter features a positive anti-loosening detent system that helps maintain a secure installation. It also captures the rear takedown pin detent spring, preserving proper lower receiver function without the need for additional components. The integrated 4-slot 1913 Picatinny rail section provides broad compatibility with many folding stocks and stabilizers currently available. For added versatility, the adapter includes a 360-degree free-rotating QD sling socket that can be configured on either the left or right side to accommodate individual preferences and shooting setups. Whether you're building a compact rifle, pistol-caliber carbine, or another platform with a self-contained upper receiver system, the Strike AR Picatinny Stock Adapter offers a durable, streamlined way to mount your preferred Picatinny-compatible stock or stabilizer. Features Mount a 1913 Picatinny interface stock/stabilizer; 4-Slot Picatinny rail section; Retains rear detent spring captured for the rear takedown pin; Quick and easy to install; Includes everything needed to convert your AR lower receiver; Orientate steel QD socket to desired side; Compatible with AR-15 ; AR-10 ;