I've never had to break in a magazine. either your magazine has a problem interfacing with the gun or it does not, repeated use should not fix that. as long is the magazine is properly lubed then there shouldn't be a need for breakin.
a clip is a simple 1 or 2 piece metal strip that allows for rapid reloading. they wear out with use....not the other way around.
all guns lost in a tragic smelting accident.
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