Inspired by the iconic B&T stock for the HK MP5, the SBT5A enhances your MP5/MP5K Reverse Stretch with an integral, side-folding machined aluminum endplate. Features: Complete assembly, ready-to-install. Machined 6061 hard-coat anodized endplate with QD socket. Integral, side-folding mechanism. Designed to accommodate a multitude of calibers (9mm, .40S&W, .45ACP, 10mm, 5.56 NATO, 300BLK). ATF compliant, US veteran designed and proudly made in the USA. Product includes: complete assembly, adjustable nylon strap. Due to varying tolerances between roller lock manufacturers, gunsmith installation / fitting may be required.