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Well, considering that CA SLR105's bodies are not very "consistent" I would blame this on the position of the hopup unit and gearbox. My issue(and many other people's) with SLR105 is that most of the mags do not fit properly at all or need a lot of shaving off. So I wouldn't be surprised that 1mm differences in mags will "push" your Hopup unit out of straight line with the air nozzle.
Question is why did it only started to happen now. Were the internals bolted down very hard when you first took the gun apart? If its too loose now maybe there is movement? Styrak are you stating generic AK facts or you have checked this AK? If you getting 100fps difference consistently between the mags it must the pressure of the mag and/or front end which dis-aligns hopup and gearbox.
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