Barrel threading

[Mattnall]

If the shoulder on the barrel is true and the thread is concentric to the bore the small amount of 'slop' you get from the clearance between barrel and moderator threads due to each being at either end of their tolerances should not matter.

[TattooedGun]

Well I'm no engineer. I'm just going by the information that was gleaned from a chap whose been gunsmithing professionally since 1977 and is well respected in his field.

He wanted the mod so he could match the thread and remove any chance of the mod moving when it isn't supposed to.

I don't have nearly 40 years of experience to question the guy.

[Mattnall]

Not disputing that, and I always prefer it to have mod and rifle together.
It is better to have it to hand than not but if the thread size is correctly given to the engineer then he should still be able to cut it to fit.
Many rifles are sold as new with threaded muzzles, the makers have no idea what moderator, if any, will be fitted.

When I did some work experience when at school at the locksmiths it was always better to have the lock and the key to cut a new key, but you could still do it without the lock (sometimes it is just not practical to drag your front door to the workshop).

[TattooedGun]

Not disputing that, and I always prefer it to have mod and rifle together.
It is better to have it to hand than not but if the thread size is correctly given to the engineer then he should still be able to cut it to fit.
Many rifles are sold as new with threaded muzzles, the makers have no idea what moderator, if any, will be fitted.

When I did some work experience when at school at the locksmiths it was always better to have the lock and the key to cut a new key, but you could still do it without the lock (sometimes it is just not practical to drag your front door to the workshop).

That's true. With the same analogy however, I've had keys cut whilst not with the lock that look right, but still don't fit...

I agree in principle with what you're saying, and it was the way that I thought it would work, when I asked the gunsmith originally I mentioned that I hadn't yet bought a mod but wanted my rifle threaded, he recommended to get the mod I wanted, then have it cut to fit exactly. We measured the barrel of my rifle and picked the biggest thread he could fit on the rifle to keep more of the barrel material and give it more surface area on the thread to give it a more solid contact.

He pretty much said that he wouldn't cut the barrel thread without the mod because he'd seen some bad mod threads come through, and presumably when some people buy moderators, second hand or from places where refunds are not an option, although they may state the thread is 00x0 - it may not be when it comes time to thread. I'm led to believe these people still want the mods put on their rifles, and that the mod will stay with the rifle for the life of the complete system.

I of course am not one of those people, but I see where he's coming from. better to work with both components together, than do it to the customers specification and then have to rectify it or do the work twice when it comes back, not fitting, for whatever reason.