Samson Manufacturing DMR Scope Mount 30mm Rings DMR Scope Mount 30mm Rings 0" Offset 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. The only mounts on the market to combine all of the best features in one place: Features: - One handed operation - Positive locking latch - Full length clamp - Tool-less adjustability for out of spec picatinny rails - Variety of sizes and offsets Manufacturer:Samson Manufacturing MFG Number:DMR30-0