Indeed, and the reason is simply because pistol calibers produce so much less.... Energy. Compact to a fault, lowest recoil, easiest to suppress, is all great till you run into something that requires more of everything you compromised ... I think my next upper will be a 1 in 6 twist .224, 12 inch carbine chambered for 100grn frangibles, and a generic surefire can will make it work just fine.
Indeed, and the reason is simply because pistol calibers produce so much less.... Energy.
Exactly. But when you want and need stealth, the 5.56 does not cut it.
The 100 grain frangible work-around is just that. It still is half the power of a .45 standard ACP, if it is kept subsonic.
One of the really big problems with the 1st gen sub-guns is they are extremely heavy compared to locked-breach systems.
It should be possible to engineer a locked breach, integrally suppressed .45 or 9mm that weighs under 6 lbs, is compact, and is extremely controllable and accurate to 150 yards.