alot of factors to consider. paint to barrel match, cheap paint vs. quality paint, holding the pump handle forward while shooting, reg may be dirty and needs to be relubed, lower internals dirty and need to be cleaned and run without lube. give us a few more details and we can be more helpful.
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CCM Works Sniper, Thumper, Kingman Hammer Low Pressure with Vertical ASA, TPX, Ion mech/closed bolt