The SP-Series from Midwest Industries are premium suppressor ready handguards. Made from 6061 aluminum, these handguards are sure to provide a long life of service. Feature: Extremely rugged, 1-piece free float design and construction Featuring seven sides of M-LOK (TM) compatible slots 1.95 inches over mounting flats High quality MIL-STD 1913 top rail, T-marked for accessory location Construction from 6061 aluminum, hard coat anodized for a lifetime of service MI lifetime warranty 100% made in USA keeps America working