I had a gunsmith thread 3 barrels. He said they are 5/8-24 and the other 1/2-28. The issue iam having is the muzzlebreaks will not screw up on the threads, they will go about two rounds then get way too tight to go any more. Its like the threads on the barrels are not cut deep enough? What type of die would i need to fix this? I dont know much about dies so i need help. Some say unef on the die and some say unf, i dont know what to buy?I measured the dia. Of the threads and they are very close to 5/8 and 1/2 inch.