The 10 round mags are tight. Put 9 rounds in and leave it for a week. Come back and cram # 10 in and leave it for another week or two. The problem will go away.
Common with the G30 10 round mags.
BTW - nice choice!

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Those who built on the wall, and those who carried burdens, loaded themselves so that with one hand they worked at construction, and with the other held a weapon. - Nehemiah 4:17
The 2nd Amendment “guarantees the individual right to possess and carry weapons in case of
confrontation.” (Heller p. 19.)
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