Our BFI™ Rail line is durable, reliable, and Proven™ while featuring Type III Hard Coat Anodizing, QD Sling Swivel Mounts and the classic Bushmaster™ snake on each rail. Our M-LOK® rail is designed for a slim profile on your rifle.  Features: - M-LOK® slots  - QD Sling Swivel Mounts - Machined from 7075- T6 Aluminum  - Length: 12.5 inches  - Each rail comes with a barrel nut & mounting screws   * requires a 1-1/8" wrench  Made in U.S.A.