Recently picked up a leaky 2nd or 3rd gen micromag. So far I've replaced all o rings with new ones, and lubed the heck out of it. If I fire a hundred or so shots through it, the leak stops for a moment, then begins again. The leak stops when the trigger is pulled, and I've made sure the power tube and on off orings are good. It has a Reactor on/off valve( first one I've seen), and the top seems really worn, so I replaced with the on/off from a Minimag, still leaking. Sear pin was adjusted all the way out to the trigger, so I adjusted it to the credit card gap, still no change. This thing is pretty well used, the only visible wear I noticed that could contribute to the problem is a depression in the body under where the on/off meets the sear. Same diameter as the on/off top. I thought about slipping a washer, brass disc, shim, etc. over the top, maybe that's where it's happening, since the leak is so great it's hard to tell if it's from the body or down the barrel. Any ideas?