Purchased A&A Duty Series Threaded Barrel & a Thread Protector 11 AUG 2023. The thread protector goes on about 1 thread and locks up. I tried different thread protectors and got the same result. I then tried the A&A thread protector on another barrel and it was fine, implying there was something wrong with the threads on the barrel itself. I notified Arm & Ally via their website (Ticket: CS00036937) on 16 AUG of the issue and to date have received no response. I am now leaving on a multiple-destination trip to Ft. Jackson 4 SEP - 8 SEP, Ft Lee 8 SEP - 11 SEP and then to Maxwell AFB 13 SEP - 25 SEP and have no way ahead.