Considering this using a 527, 223 carbine as a donor. Seems I need bottom metal from a 7.62x39 or 300 Blackout and a 300 blackout magazine, the 350 legend is a tight fit in the 39 magazine but a friend loaded a 300 blackout magazine without a problem

So where would be the best place to get the bottom metal, CZ does not list it. If anyone has the part shoot me a pm

Johno