Burris' AR P.E.P.R. Scope Mount is a full ring and base mounting solution in one. It allows up to two-inches of forward scope positioning and includes both smooth and Picatinny ring tops. This model has 30mm ring size.The Burris PEPR mount has become the absolute go-to mount of choice for an incredibly solid, long-lasting cantilever mount. It makes mounting an optic to an AR-style rifle very easy, providing the necessary clearance and adding as much as 2 inches of forward scope positioning. It also ensures proper eye placement in fact, PEPR stands for proper eye position ready (although it's easier to just say pepper mount). Features: The PEPR mount is a perfect AR or flattop mounting solution Allows up to 2 inches of forward scope positioning Provides optimum eye relief and full field of view Includes both smooth and Picatinny ring tops