Used 10.5" 300 blk upper 1:8 twist. YHM Diamond Series Specter length quad rail with end cap. Barrel is threaded 5/8x24 with a jet compensator. Has a few character marks but is fully functional. I used this as an SBR for hog/deer and whatever wanted to take a bullet. I shot this both suppressed and not, never had a FTF or FTE. On a very high guess I would say 400 rds max through the upper using subsonics and supers. CH and BCG are brand new. Located in McKinney and travel to Dallas for work so meeting along those lines are perfect. Asking $400 and will consider trades as well. Packaging pictured is not from this upper.