[Mr. G36!]

So I had a JG M4 and it worked very well. I've never opened the mech-box, so that should be good to go. I switched out the body for a Guarder metal one, and the barrel (inner & outer) for G&P ones. As such, I also replaced the Hop-Up twice, once with a G&G, and now with a Guarder.

Basically, there's some horrendous feeding issue. The FPS is consistent when it actually fires, and the Hop-Up seems to work as well, but the gun only actually fired now and then, leaving most of the BBs stuck inside the chamber.

It's not the mags, because I can't seem to find any by any company that work consistently. And I've tried different Hop-Ups, and have the same issue regardless. The barrel is fit properly, so the rubber isn't twisted or jammed, and like I said, when BBs do leave the barrel, the FPS and trajectories are consistent.

So what might the issue be? I can't shake the feeling that it's just a Hop-Up incompatibility, but since I've tried a few, I'm thinking maybe it's the fitting of the body? Or maybe the JG mechbox just won't work properly with other brands? I dunno...my work with TM items has never failed me, but this JG thing is really annoying me. I was thinking of just getting a whole new mechbox, but I don't know for sure that that's the issue, so I'm looking for some advice first.

Thanks!