The MDT Scope Ring Cap Accessory Picatinny Rails are designed to fit with the MDT accessory scope ring caps. The Picatinny Rail is ideal for mounting bubble levels, data card holders, rangefinders, and more. Integral recoil lug and offset mounting holes to prevent attached accessories from shifting under recoil.FeaturesAdhere to STANAG 4694 rail profileIdeal for mounting bubble levels, data card holders, red dots or rangefindersIntegral recoil lug and offset mounting holds to prevent shifting under recoil