Electronic Crosshair Scope fits RIS system, M4 G36 SG 552
Fits All RIS system. Replacement part for our best seller M16 M4 from double eagle (M83) Product Link: http://www.amazon.com/gp/product/B000F2WVDW/qid=1151947707/sr=1-1/ref=sr_1_1/103-5567909-7446212?%5Fencoding=UTF8&s;=sporting-goods&v;=glance&n;=3375251