Every now & then the question pops: how to attach taclight to gen2 or gen1 glocks. Surefire makes a rail interface for the old style taclights M001, M011, P001 & P011. Its called the MR01 rail adapter (surefire part no. 13341-1). Just attach to the trigger guard and your old glock can now accept taclights. Slight modifications, dremmeling, maybe required though. I tried to mount an SF X200 but it wouldnt lock up. The x200 needed an extra 1 millimeter rearward movement to lock properly. Havent tried glock's taclight yet.