Presently have a 1:7 16" on my AR but I've gotten tired of having to sort and separate my ammo for the AR & bolt gun. Does anyone know if there's a barrel for the AR that's 16" standard contour (don't need a bull) that's chambered in .223/5.56 with a 1:14 twist rate? I shoot Nosler 35gr BT's or 30gr Varmint Grenades out of the bolt gun (1:14 barrel) and want to share ammo, needless to say the 1:7 twist rate doesn't handle the light bullet very well. I've put up with it for 2 years now and finally decided it's change barrels to the slow twist (if I can find one) or sell it. Because of this I've only put 2 mag loads through it in 2 years, yes 60 rounds in 2 years. Whereas I've put 1000+ through the bolt gun.