All really depends on what you are using. From receiver to gearbox to hopup to BB's even.
I have no issues with the feed plagued plastic KA midcap nor have I filed the retaining clip. I really like the metal CA 130rd midcap but as they age they do start have fixable problems. Springs need to be stretched and the entire feed path needs a bit of lube more regularly. Have not had any problems with a couple of S Arms 160rd metal midcaps.
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