11" 223 in a 1-7 twist shoots 77gr amax consistent 3/4 moa with a Ranger AAC suppressor. Total barrel length with can is 16"

20" 30 BPC 6.5 Grendel necked to a a 30 cal

223 Bull Barrel 20"

Mag Pul fully adjustable stock

Daniel Defense hand guard with a JP Adjustable gas block

Superior Arms AR Lowers

16" 30BPC with a Ti muzzle break and also pic below is of same weapon with AAC Cyclone K suppressor on it

AR 223 Shorty

This is a switch barrel upper that allows you to switch out the barrel by opening two levers and putting in a new barrel.  Total time takes between 5 and 10 seconds.