marui M&P9 light striking?

[kudougw]

Hi
recently noticed that my M&P9 light strikes when bbs are loaded into the mag, it shoots fine while dry firing, but once bbs are loaded into the mag, it would only weakly shoots out the bb without the slide moving back, I have tried different mags so mags are not the source of the problem.

FYI I got the detonator slide on and it with the steel hammer set. everything else is stock.

[.45]

Mine started light striking toward the beginning of spring. Turns out I was warming my green gas tank too much with a heating blanket and the psi inside my mags was just too high. This was on all stock parts aside from the slide. I hope this is the same issue you are having.