Ar15 pistol
This is the first I've heard of marking a lower on the 4473. I gotta look into that.
From my experience, I'd go 10" barrel. I don't want my hands that close to exiting projectiles and remember no vertical grip onna front. See the NOT PLEASANT pics from the Kel-tec shotguns to see what I mean. Pistol rounds don't kick like .223/5.56.... UPDATED: Another devastating Kel-Tec KSG injury - The Gun Writer
Unless you're committed to visibly marking ammunition, mags, and guns, and keeping them FAR apart, I would not run 300 Blackout, either. Get one of those 300 BLK rounds in your 556 ammo, and you will have a bad day. It WILL chamber and fire. I kinda want to build a 300 BLK but I can't imagine my wife or anyone coming along after me realizing what's up until it's blown up in their face.
Nowadays, I feel that the 300 BLK, although neat as hell, was poorly executed specifically for this reason.
AGAIN: 300BLK In 5.56 Rifle -
This is the first I've heard of marking a lower on the 4473. I gotta look into that.
From my experience, I'd go 10" barrel. I don't want my hands that close to exiting projectiles and remember no vertical grip onna front. See the NOT PLEASANT pics from the Kel-tec shotguns to see what I mean. Pistol rounds don't kick like .223/5.56.... UPDATED: Another devastating Kel-Tec KSG injury - The Gun Writer
Unless you're committed to visibly marking ammunition, mags, and guns, and keeping them FAR apart, I would not run 300 Blackout, either. Get one of those 300 BLK rounds in your 556 ammo, and you will have a bad day. It WILL chamber and fire. I kinda want to build a 300 BLK but I can't imagine my wife or anyone coming along after me realizing what's up until it's blown up in their face.
Nowadays, I feel that the 300 BLK, although neat as hell, was poorly executed specifically for this reason.
AGAIN: 300BLK In 5.56 Rifle -
