Using the allen key to tighten the CO2 cartridge in place, I gave it 2 or 3 more full turns than I usually do. Now it's firing a lot better, I went through 7 full magazines without it jamming (alternating between semi and full auto). It jammed once on the 8th magazine, and it didn't jam on the 9th. 1 jam in 170 shots is a lot better than what I was getting (previously 1 in 10).
So maybe I just haven't been tightening the CO2 cartridge enough up until now.
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