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Ok... so the gun was bought used. I'm just curious about the mag now.
I was told that TM M9 mags worked with KJW M9s, so I bought one. The thing fits and seats perfectly, but does the exact same thing as yours. I get 2 normal shots with full blowback, 3rd shot has almost no power, ad the gas just vents out. This may not be the case, but perhaps it's not the gun, but an incompatible mag? For kicks, take a pic of the fill valve on the mag and post just so we can see. TM and KJ have different fill valves. Maybe that's the problem.
Just throwing out ideas here
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