I don't exactly know what your trying to describe here. Using the word compression is a bit vague!? Does your pistol fire at all when the mag isn't being pushed down? Or your magazine is just loose? How does it fire differently between "firing just fine" and "when you don't push the mag in?"
If your talking loss of compression, Check your loading nozzle assembly for cracks (piston lid, Loading nozzle, floating valve). Often times it's the source of this issue.
Also, it's normal for your mag to wiggle back and fourth in the magwell. When it wiggles up and down is when there may be a problem.
either way it sounds like your mag catch is not holding the mag in place.
The fix: Get a new magazine catch!!!!!
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"May you fight with the strength of ten full grown men."
Last edited by e-luder; June 5th, 2012 at 02:03..
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