Midwest Industries Tri-Rail, One-Piece Free Float Handguard, Fits MP5K, Hard Coat Anodized Finish, Black, M-LOK Angeled Slots MI-MP5K-TRIRAIL The Midwest Industries Ultra Lightweight One-Piece Free Float MP5K Handguard is constructed of rugged 6061 aluminum with a hard coat anodized finish. It features a Tri-Rail 1913 Picatinny on 3 sides for accessory attachment" M-LOK angled slots for light mounts" a pair of anti-rotation QD sling swivel sockets. 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.