Blow back was a problem I had when I had a cocker, since the cocker didn't have a hole to let the air escape it caused balls to shoot up in the feed tube. Powerfeed makes blowback very un noticable cause there i a big hole to let the air out. PF is also good at centering the barrel , with the classic you had the hopper way out ot the left or right.
Power feed is good.
Power feed is good.
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