The IMI Defense Kidon™ Adapter easily assembled with an Allen key and provides a fast transformation of pistol brands. The K18 adapter fit of Polymer80 pistols with a Picatinny rail.
 
Polymer 80 Frames PF940v2 80% – Standard | PF940Cv1 80% – Compact | PF940CL 80% – Compact Long Frame | PFC9 Compact Pistol Frame (serialized) |PFS9 Standard Pistol Frame
(serialized).  Fits Also  Beretta APX