Irunguns won't be able to help. The 33 round Glock mags are a no-go now that the State Department is denying export of mags over 32 rounds.
They fixed that problem by changing the base plate and now they are 31 round mags I believe.
You asked about 10/33 mags so my post is still relevant. Great news though, buy 31 round mag and +2 baseplate and presto....



























