The Midwest Industries® Top Picatinny Rail for HK® MP5 is an aftermarket Picatinny rail that allows users to mount an optic or laser on top of the HK MP5 while retaining the factory handguard. This rail features forward M-LOK® slots for additional accessories and is constructed with 6061 aluminum with a corrosion-resistant hard-coat anodized finish. Designed to fit 9mm receivers and there may be fitment issues with .40cal and 10mm receivers. Counts as a 922R compliant part. Lifetime warranty. Made in USA.