Threading .243 Rifle

[treerat assassin 0]

i have bought a sound moderator for my 243. It's got an M18 x 1 thread and it's going on to a heavy barrell. I am going to get the thread cut onto the barrell by very good and trusted engineer but just not sure how long the thread should be on the end of the barrell.

 

Any help would be gratefully received.

Thanks.

[matt_hooks 188]

First thing to ask is, is the engineer competent with guns? To screwcut a barrel you need to make sure the thread is concentric to the bore, not the outside of the barrel. The two things can be very different.

 

If he knows what he's doing with guns, then he should know how much thread is required.

[SNAP SHOT 194]

As above, i've seen some disasters of threading jobs by "great machinests"

 

the thread has to be two things, square to the bore and not the OD of the barrel, and of a size and thread suitable to the barrel

 

one man i saw cut 1/2" 20 into ALL barrels....!!!!! even heavy profiles,

 

My advice is take it to a gunsmith, for 100 quid or so its cheap, whereas if he makes a mess of it, its cut and inch of the barrel, thread and recrown,

and that only means more money......

 

Snap.

[treerat assassin 0]

Well, thanks for your input. I am not doubting my mates ability. In fact he is far more experienced and capable than of any of the gunsmiths I have met. We are not talking "some bloke with a lathe in his shed".

If anyone can come up with a useful answer it would be most appreciated. If not I'll just have to go to the gunshop and measure one already done.

Thanks.

[SNAP SHOT 194]

I'm not trying to say your mates a bad engineer, my father is one of the best really skilled in all areas of engineering, but no way would i let him near my gun,

its not doubting his ability,

 

But what happens god forbid if you mate messes up your barrel, will he stand over it...? i know plenty gunsmiths who stand over what they do..

 

you don't say what exact barrel profile you have other than heavy barrel, So info will be limited,

 

good luck

 

 

Snap.

[matt_hooks 188]

As snap said, I'm not questioning your mates ability or experience AS AN ENGINEER. I'm asking if he has experience with guns. I'm skilled with a lathe, but I wouldn't take on a barrel threading, due to the variables involved.

[Exbomz 0]

If I can just add a thought, what about re-proofing the gun after the work?

[matt_hooks 188]

  On 17/11/2010 at 21:00, Exbomz said:

If I can just add a thought, what about re-proofing the gun after the work?

 

Not legally necessary, but agreed a good idea.

 

Any RFD should be able to arrange re-proofing though, not too expensive either.