Midwest Industries M-LOK 1913 Milspec Rail Section, 3 Slot, M-LOK compatible, Black MI-3MR Easily add M-LOK rail sections to your M-LOK equipped handguard with the Midwest Industries M-LOK 1913 Mil Spec Rail Sections. Now you can place your accessories where you want and need them" leaving you with a smooth handguard everywhere else. 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.