The SOCOM II M1A Rifle is a compact, powerful close quarter combat battle rifle. However its "Cluster Rail" system makes it difficult to mount a conventional low powered scope. You have to install an additional receiver mounted scope base to the SOCOM II along with a set of scope rings that are tall enough so that the objective lens clears the top rail. If you want Quick Detach capability, you need to mount your scope on top of the receiver mounted scope base with some type of QD mount and ring combo. We think that's a PIA and has too many interface points that could negatively affect the zero retention of your scope. The New Products Team at GG&G has come up with an inn Mfg: Gg&G SPECS: 2.5" measurement inside ring face to inside ring face allows for forward/rearward adjustment of different eye releif scopes. 1.260" from top of the rail to center of 30mm integral rings, provides lower scope mounting while still clearing the objective lens of most scopes up to 50