8.5" 300blk upper, come with the holosun HS503GU on riser. has an adjustable gas block and pistol gas tube. No BCG or CH. was tuned and set for a lahar 30k zeroed and dialed for 25yrds (obviously doesn't help you if it's different can and or ammo but it was). 

had for "truck gun" but going different route so don't need it anymore. 

txt 623-258-7255