Features: Extremely rugged, one piece free float design and construction Featuring seven sides of M-LOK compatible slots Inside diameter 1.670 inch, outside diameter 2.0 inch, 1.95 inch over mounting flats Made for use with suppressors no larger than 1.55" in diameter High quality MIL-STD 1913 top rail, T-marked for accessory location One five slot M-LOK polymer rail section included Barrel nut and barrel nut wrench included Construction from 6061 aluminum, hard coat anodized for a lifetime of service 7.25" - 9.0oz MI Lifetime Warranty 100% Made in America - Keeps America Working US Patent Number USD788871