The Strike Industries SI-AR-PSA-BK AR Picatinny Stock Adapter in Black enhances shooting versatility by enabling easy attachment of a 1913 Picatinny stock to AR-15 and AR-10 lower receivers. Designed for maximum efficiency, this adapter offers broad compatibility with various folding stocks and stabilizers, enhancing your firearm's functionality at an affordable price. 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 Transform your firearm and optimize your shooting potential with the Strike Industries Picatinny Stock Adapter.