Samson DMR Scope Bases feature rugged styling, tested return to zero capability, and one handed quick release locking mechanisms. These mounts are constructed of 6061 T6 aircraft grade aluminum, stainless steel locking mechanisms and multi-start threading for rapid quick release action.Samson DMR scope bases feature rugged styling, tested return-to-zero capability, and one-handed quick release locking mechanisms. Scope mounts are constructed of 6061 T6 aircraft grade aluminum, stainless steel locking mechanisms and multi-start threading for rapid quick release action. The only mounts on the market to combine all of the best features in one device. Features: One-handed operation Positive locking latch Full length clamp Tool less adjustability for out-of-spec Picatinny rails