They work with OEM and other mags for me so far(not most 3d printed mags tho). I do have one made to fit my 3d printed mag.
V3 V-lock base pads are the same except they have a locking tab that I print at 98% 100% infill and it will need supports.
V5 dose not have a locking tab to hold it in place(its just like the ones you can buy)
+2 works with stock spring
+6 needs longer spring
+6 v-lock version uses the same v-locking tab as the +2 (have not printed yet)
+2 v-lock works good
I have used most of them for years just thought someone might like them too.

If you live in a (communist) state that has a limit of 10 rounds don't print this.
this is for air soft...of course.... if it fits the real thing that is just a happy accident.....

Monoprice

Select Mini

No

No

.2

20