Bwaaah.
Like everyone else said above me, it is a MAG, or Magazine. Not a Clip. I can bring out the comparison image if you need of a clip and a mag.
Anyway, some guns are just picky about their mags. You could try identifying problems in the mags (since it seems the magwell is most likely not be the problem) and go from there. What do you mean, 'inconsistent fire'? Is the BB coming out at all, or is it rolling out? We need a bit more detail.
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