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I have had no issues with the Gen2 Spears mags, as well as the AR-stoner modified 10 rnd mags.

But the 5 rnd mag that comes with the CJA and the 5/7 rnd AR-stoner ones with the differently wound...

I too had the same problem with my first Bushmaster, and more or less determined it was the mag's.
When i changed to better magazines it went away (...but then again i later changed my AR too :P)...