[DugwayDuke]

desertsolitaire wrote: “They would need a pistol brace wire stock added”

Minor improvement. A pistol is so light, the recoil would be uncontrollable.

[desertsolitaire]

Maybe a heavy suppressor would add weight and control muzzle climb

[Myrddin]

Even a G18 with a forward grip and a proper stock is a handful. I burp 3 to 5 round bursts max to keep it on the paper at 15 yards.