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1. is there any way to fix it? I installed the RIS unit a few years after I installed the metal recevier/front cocking tube bits, so the part that slides into the receiver may have lost some metal since it was really tight when I initially installed the metal kit.
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The trouble is that the stock cocking tube assembly is not well attached to the receiver. It just isn't meant to take the weight of the RIS.
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2. how about crazy gluing it into the receiver? It would probably do a decent job of keeping it from slipping, but is there any way to 'un-crazy' glue it if I ever need to get into the guts and repair anything?
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Crazy glue will crack quickly and need to be reapplied. Acetone will melt crazy glue quickly... but expect some damage to your gun in the process.
You could take out the cocking handle and slide a copper pipe into the tube assembly for now, but you need to reinforce the joint. A short copper pipe (2 inches) inserted into the joint between the receiver and the gas tube assembly and then secured somehow would probably do the job.
Mind you I'll need to look at my own MP5 to figure out exactly how I would do it.