bought this upper to build a 300blk out suppressed arpistol, The thread is 1/2x36 so finding a direct thread suppressor is virtually nonexistent. I would still recommend this upper for anyone that isn't going to suppress it.
*****Ammunition Notification***** Ghost Firearms test fires every custom upper to verify cycling. We do not guarantee cycling with all ammunition due to vast differences in the quality of ammunition. We will only warranty cycling with US made ammunition. We will not warranty cycling with imported, steel cased or reloaded rounds.
Please allow adequate time to build and test fire all uppers