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Is the cover slightly warped near the clip? I had the same issue with the dust cover on my CA M15a4 CQB, as did my friend with a CA Seal CQB. Im thinking its because the metal used for it is flimsy and bends/deforms and doesnt allow for the clip to engage after a bit of use. I fixed mine by lightly bending the cover back (more straightening than bending) - i used a metal ruler as a straight edge to guide it. Its not perfect but engages a lot easier now.
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