The compact mount is lightweight and made of aluminum alloy. The one piece 30MM design makes it easy for installation and the added level feature ensures proper mounting. Fits a wide array of Osprey scopes including but not limited to the CP3942IRF/MDG, 1-6×24, 1-4×24, SD6x42MOA, SD4x32MOA, 4x32CB(w/ shims), CP3-9x40MD(w/ shims), SD1.5-5x32MDG(w/ shims), and SD2.5x20DP(w/ shims).