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last time i checked, the air is suppose to vent air out the back, after every shot its just the bolt moving back and for the bolt to return, it has to vent out the air in the back, the faster the air vents, the faster your bolt cycles, its a good thing, CP back caps allow 40% more air to be vented meaning faster bolt cycles, not im not sure if thats been proven but it means venting is good.
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