if the socom mag is thinner than the stanag, or if the catch can catch into the window completely. You might be hearing it click as it sort of falls into the window but not enough of it is holding it in properly so if the mag is narrow then any sort of shift in the magwell will move the whole thing away from the catch.
Also didn't I read somewhere before stealth mentioning the VFC mag catches didn't seem to be as catchy as other brands?
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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