Is there any real advantage to a pistol-calibre weapon having

>>33148996
you dont have fuck huge bolt slamming all over the place

>>33148996
Gas piston, lighter bolt, and a decent spring could mean you never have to hit the back of the receiver and deposit energy in the shoulder. So, lighter recoil.

>>33148996
also, higher firerate

>>33148996
Controllable full auto

File: Evers_Type_79_SMG.png (48KB, 801x371px) Image search: [Google]

48KB, 801x371px

>>33148996

Weight.

The Chinese claim a Type 79 weighs 3.8-4.1lbs (depending on source).

For reference, a PPS-43 (dirt simple blowback) weighs about 6.8, despite having a shorter barrel.

>>33148996
Mostly comes down to the bolt. Almost every PCC uses simple blow back because it's easy, but that means you have to have a heavier bolt. There are some ok compromises for this though. AR9s have an ok sized bolt despite being blowback and are still crazy light.