Gen 3 frames (virtually everything that takes FMDA rails) are fully backwards compatible with Gen 1 and Gen 2 parts.
this post was submitted on 04 Oct 2025
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Tried those. Something is different between them
I can see from photos online that the gen 2 doesn't have the upper support pin on the locking block, you should be able to use the frame without it on 9mm. What doesn't work?
Can't recall off hand. Tried a fmda as well as another makers.