iirc m8 mags lock high up on the front , and psp mags lock low on the back . Some m8 mags had the locking hole cut low on the back , but you would have to grind off the locking " teat " on the front to use it in a psp . Since right now p7 mags are more expensive than psp mags this wouldnt make a lot of sense to even try , and would ruin the mag for the intended model .
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