My interest in PCCs stems from shooting IDPA, USPSA and Steel Challenge with them. If you’re not playing the gun games, I’m not sure that carbine-length PCCs are all that useful. I do think a 7-10” or so pistol with a brace is worthwhile as a home defense or truck gun, especially given the ability to mount a light, laser, optic, etc.
I recently chrono’d my 16” AR rifle, 8” AR pistol and Glock 19 with Blazer Brass 115 grain FMJ to make sure I was making power factor with the rifle, and to see what the velocity difference was by barrel length. Here’s the average chrono data:
16” rifle: 1350 fps
8” pistol: 1240 fps
Glock 19: 1104 fps
I do have a 16” Scorpion that I used to shoot in the gun games. It’s well-made, and mine’s been 100% reliable, but there’s quite a bit of bounce/recoil when you’re double-tapping targets. And there’s really no way to tune it like you can an AR variant. But I’ll keep it anyway because I like it.