OK Ballistics - Thats D.O.P.E. - Oklahoma Gun Forum
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If it's just a barrel, any good machine shop can do it. No gun, no FFL needed. I find most aviation machine shops hold a better tolerance if you have specifications you need to be followed.
At that point it's just a pipe or an axel with a hole bored through it.
1/2"X24 thread pitch is a bit different, most 1/2" is 28 thread pitch, but anyone with machine knowledge can do any pitch.
Most 1/2" barrels and suppressors are 28 threads per inch. 5/8" barrel cuts, like on 308/6.8SPC/6.5 G are 24 TPI. I know you know what you are doing, but I'd hate to see a momentary lapse cost you an inch of barrel. I really am just trying to be helpful, as I have messed up this very thing by going 5/8"X28, when I ment to tell them 5/8" X24.... Sh*t!!!
He's cutting it to 18" and threaded it 1/2x28 with an adaptor to 5/8x24. Said cost was going to be 115-120. My shooting buddy has had 4 rifles done by him and recommended him. I have his 6.5 PRC he cut and threaded doing load development on it and it looks very nice. Nice crown, threading looks great and true.