I recently acquired a used Hi Point 995 9mm carbine and have discovered a problem. After every few rounds fired, the operator handle locks in the opened position. It's quite easy to simply pull it back and release, but what an annoying P.I.T.A. I'm planning to contact Hi Point customer support tomorrow, and if necessay send the carbine in to them. I know these are supposed to be a non-stop running machine. Has anyone else experienced the lock open problem?