This gun is a further iteration on the ultra short 5.56mm M16K carbine made by La France. The M16K-45 uses proprietary upper and lower assemblies resized for the smaller cartridge, as well as using La France’s patented adjustable twin gas tube system, designed for higher reliability on short barrel guns. It uses M1 Thompson stick magazines.
I truly don’t know but please don’t touch the La France hardware with it.