Quote Originally Posted by BradyT88 View Post
If I get one it will be the 7" version. 4" might as well get a handgun. The longer carbine version likely has a minimal gain in muzzle velocity over the 7" since the 9mm is a handgun round.

Sent from my SM-G965U using Tapatalk
Hell yeah 7” for sure. That was going to be my barrel length if I built the AR9. It was gonna be a side charger and take MP5 mags. Maybe one of these days