For any 1913 railed receiver to MCX/MPX style stock. The Samson Picatinny Side Folding Stock Adapter is a robust and versatile solution for shooters seeking superior adaptability and precision. Designed to seamlessly integrate with a variety of platforms, this stock adapter ensures a secure and stable attachment. Engineered to fit perfectly with 1913 Picatinny railed receivers, providing a solid and reliable connection for your stock. The folding mechanism allows for compact storage and easy transport, making it an excellent choice for tactical applications and confined spaces. Mount for left or right fold.