Over indexed M14 barrel remedy

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elvis3006

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My TRW barrel over indexes will not time correctly. Where can I get FN breeching washers or barrel shims to tighten the barrel ? Thank you
 
How much does it turn past TDC? You can calculate how thick a shim would need to be.
Or the barrel shoulder can be rolled to upset it a bit.
With the barrel indexed, how is the headspace? Rolling or shimming can correct an indexing problem, but headspace needs to be within limits.
A gunsmith could make a shim. Or the barrel shoulder can be turned back and a thicker breeching washer made and installed.
I assume you are installing the TRW barrel on a M-305 receiver.
Might even be worth considering a different receiver. 305 receivers are easy to get; nice TRW barrels not so much.
 
tiriaq said:
How much does it turn past TDC? You can calculate how thick a shim would need to be.
Or the barrel shoulder can be rolled to upset it a bit.
With the barrel indexed, how is the headspace? Rolling or shimming can correct an indexing problem, but headspace needs to be within limits.
A gunsmith could make a shim. Or the barrel shoulder can be turned back and a thicker breeching washer made and installed.
I assume you are installing the TRW barrel on a M-305 receiver.
Might even be worth considering a different receiver. 305 receivers are easy to get; nice TRW barrels not so much.
Click to expand...

It will be going on LRB receiver, it was originally on a SAI receiver and it shot loose lol. I can hand tighten it to its original headspace easily, all parts including bolt are USGI. I cannot tell right now how far past TDC is as I do not have an available receiver to test it on and the SAI receiver it was on before has another GI barrel on it. Thank you
 
I would be inclined to fit a breeching washer so that the barrel will pull up solid with good torque.
Quality parts, permanent fix.
Don't know where breeching washers or shims can be purchased, ready to go. Can certainly be shop made.
 
tiriaq said:
I would be inclined to fit a breeching washer so that the barrel will pull up solid with good torque.
Quality parts, permanent fix.
Don't know where breeching washers or shims can be purchased, ready to go. Can certainly be shop made.
Click to expand...

Thank you, yourself or anyone on this site know someone who can shop make them ?
 
It's not a common practice to use a breaching washer on these rifles although it has been done by at least one major manufacturer.

I'm not really doing the "giving of advice thing" but this is one area that I have addressed a great many times on my bench with excellent results.
Depending how far past TDC your barrel turns to..... of course.

The common method is to use a lathe with a roll swage tool set up. The shoulder is then rolled back towards the breach, without rolling it over.
The common method without a lathe is to use a flat faced hammer and on an anvil or other suitable steel surface, the shoulder is roll peened towards the breach. This is surprisingly easy to do.
Once the job is completed the barrel should come hand snug 15 to 20 degrees off TDC. I recommend 20 degrees for this application and 15 degrees for new barrels.
80 (minimum) to 90(preferred) foot pounds of torque should be required to set the barrel at TDC and it should never need to be touched again.
 
Last edited:
45ACPKING said:
It's not a common practice to use a breaching washer on these rifles although it has been done by at least one major manufacturer.

I'm not really doing the "giving of advice thing" but this is one area that I have addressed a great many times on my bench with excellent results.
Depending how far past TDC your barrel turns to..... of course.

The common method is to use a lathe with a roll swage tool set up. The shoulder is then rolled back towards the breach, without rolling it over.
The common method without a lathe is to use a flat faced hammer and on an anvil or other suitable steel surface, the shoulder is roll peened towards the breach. This is surprisingly easy to do.
Once the job is completed the barrel should come hand snug 15 to 20 degrees off TDC. I recommend 20 degrees for this application and 15 degrees for new barrels.
80 (minimum) to 90(preferred) foot pounds of torque should be required to set the barrel at TDC and it should never need to be touched again.
Click to expand...

Thank you, if I cannot find a good shim I will try this.
 
I have a device designed as a choke roller - to choke shotgun barrels that have been shortened. It works as a roller for rifle barrel breeches as well. Carefully done, the peining method will accomplish the same thing. In effect, the barrel shank is shortened slightly.
 
tiriaq said:
I have a device designed as a choke roller - to choke shotgun barrels that have been shortened. It works as a roller for rifle barrel breeches as well. Carefully done, the peining method will accomplish the same thing. In effect, the barrel shank is shortened slightly.
Click to expand...

Thank you, should the shim method not turn out we will try this.
 
Another poor mans way of rolling the torque shoulder is to use a Brownells style barrel vice without the barrel inserts.
Just tighten the vice jaw half's together while the vice jaws are around the torque shoulder, do this several times while rotating the barrel when the jaws are loose.
 
I would need 45’s advice....

I won’t instal a barrel with a washer..... roll the shoulder and use some lock-tite if you are a belt and suspenders type of guy...

John
 
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