Midwest Industries Handguard, Fits HK MP5 and Clones, M-LOK Compatible, Mil-Spec Top Rail, Black MI-MP5M The Midwest Industries M-LOK Handguard for the HK MP5 adds tactical modularity to the classic subgun design. It is constructed of 6061 aluminum with a hard coat anodized finish" and features M-LOK mounting slots along its length for accessories. It comes with one 5-slot M-LOK accessory rail and two anti-rotation QD sling swivel sockets. This rail is a slim 1.6" in diameter and weighs a scant 4.8 oz. Midwest Industries is a proven leader in the firearm industry. Made in the USA" focusing on the small details to make your rifle platform better.