Aut cum scuto aut in scuto
Whole lotta flash and bang, not much else.
a hand grip handle on an M-67 would do as much good...
Probably California street legal.
More show than go. Lack of barrel creates a lot of noise,flash and recoil whole dropping muzzle velocity to a level that make the round much less effective.
Does the bullet tip poke out of the muzzle?