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.

PDF on the La France twin tube gas system.

    • SSTF@lemmy.worldOPM
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      4 days ago

      The upper receiver is definitely all made by La France. The boxy Fisher-Price looking carry handle is quite distinct. All sources say the lower is also proprietary, but I’m pretty sure they at least started with an existing 80% lower and modified it given how standard all the fine details look, and how drastically different the machining is to the upper.

    • SSTF@lemmy.worldOPM
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      4 days ago

      I truly don’t know but please don’t touch the La France hardware with it.

    • SSTF@lemmy.worldOPM
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      4 days ago

      It’s firing .45 ACP (Automatic Colt Pistol), a pistol cartridge, out of a 7.5 inch barrel. It is stabilized. For comparison the standard size 1911 has a 5 inch barrel, the Kriss Vector SMG has either 5.5 or 6.5 inch barrel (depending on model), and the M3 Grease gun has an 8 inch barrel.