If you really want a third pin for whatever reason, the Bi-Poly has an NFA variant. Other than that: Defiance, SL-15, UBAR, etc.
https://guncadindex.com/search?query=tag%3Aar-15+tag%3Agun+time%3Ayear+sort%3Apopular
If you really want a third pin for whatever reason, the Bi-Poly has an NFA variant. Other than that: Defiance, SL-15, UBAR, etc.
https://guncadindex.com/search?query=tag%3Aar-15+tag%3Agun+time%3Ayear+sort%3Apopular