Thank you rsterne. I am taking it to Fastenall, they have a device to measure it exactualy. I will let you know how your guess was!Rob M. It is the LDC builder who is asking me the size. He has not done one for the Bully.
Had the threads measured today. They came up with the same thing I did using my pitch gauges. The Hatsan Bully .45 is a 16mm by 1.25 pitch.Mailing the barrel across the country and back seems like asking for trouble.
Rob M I didnít mean to come off wrong. I do appreciate your post. The builder doesnít want to be responsible for keeping track of customers parts. Which I can understand. I was going to send him the threaded collar. Small inexpensive to ship and would be perfect for matching threads. But also very easy to be misplaced. Darrell