Hi Gents, I have a spare Blaser barrel in .308 with fixed iron sights.
I wanted to move the front sight back just enough to get the barrel threaded.
The gunsmith suggested a 15x1 spigot but that would put at least 3" of muzzle in front of the sight and make the distance between front and rear sight about 14" making the whole setup look out of proportion.
So I suggested having a 1/2"x 20unf thread which would only leave the diameter of the barrel forward of the muzzle, making it look a little better.
However, when I mentioned the 1/2" thread you would have thought I'd just told him I eat babies !!
His hands went up and his eyes nearly popped out of his head with shock.
He asked if I was serious and when I said yes, he wanted me out of his shop straight away !!
(a bit of poetic license there really)
What he really said was that he did not recommend a 1/2" thread on a .308 and suggested I think again.
I have had a 1/2" thread on a Remington .308 for a few years and had no problems, so I would like to throw this question open to the learned members of this site and any gunsmiths that may be lurking, why is a 1/2" thread not recommended for a .308 when it is probably the most common thread used across the board.