Midwest Industries Handguard, Fits HK 91 and Clones, M-LOK Compatible, Mil-Spec Top Rail, Black MI-HK91M The Midwest Industries HK M-LOK Handguard will give you the modularity you want to add lights and other tactical accessories to a classic platform. This model features 37 full and 7 half M-LOK slots" and includes one five slot M-LOK compatible accessory rail. There are also four anti-rotation QD sling swivel sockets. Fits HK 91 and clones. 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.