Barrel liners

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  • Last Post 31 December 2022
Premod70 posted this 29 December 2022

Question to those in the know; is a barrel liner legal in a correct barrel/ receiver military combination. Possibly a way to bring a shot out rifle back up to competitve standards.

Forrest Gump is my smarter brother.

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Aaron posted this 29 December 2022

If I were on a committee to decide, my answer would be no.

  • The liner is no longer war-time production like the other barrels are. Tolerances are tighter. Rifling is sharp and may be different altogether than the original rifling with regard to depth, twist, number of lands and grooves, etc. This would provide a distinct competitive edge to the other war-time produced barrels.
  • Steel quality of the liner would probably be superior to war-time production material and provide a competitive edge.
  • Liners allow "truing" of the bore to the barrel axis.
  • Liners can true up bore axis to chamber axis.

Bottom line is that we have left war-time production methods and material with a modern liner. I am not on any voting committee regarding this but this is how I would vote if the question came about.

Is a NHRA Class-A Top Fuel Camaro really a Camaro?

 

With rifle in hand, I confidently go forth into the darkness.

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John Carlson posted this 30 December 2022

The answer is no.  For all classes in military competition the action and barrel must be issue.  Any modifications other than shortening as allowed in the modified classes would disqualify it.

John Carlson. CBA Director of Military Competition.

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RicinYakima posted this 29 December 2022

(a) Military Rifles

[1] Issue - Any military service rifle issued to any nation and legally sold as surplus in the US and in strictly as issued configuration. The only modifications allowed to the Issue rifle are -- front sight height may be raised or lowered as long as the original profile is kept, the sling and swivel may be removed and a slip on recoil pad may be used.

[2] Modified Iron - Any military service rifle issued to any nation and legally sold as surplus in the US and with issue action and barrel. Stocks may be either issue stocks, modified military stocks or sporter stocks. Modified military or sporter stock forearms may not be wider nor flatter on the bottom than the original stock issued for that rifle. Modified military or sporter stocks may not weigh more than the original issued stock. Any trigger and iron sight may be used and glass bedding is allowed. The barrel may be shortened to a minimum of 20 inches unless that rifle was issued as less then 20 inches.

[3] Modified Scope - Any military service rifle issued to any nation and legally sold as surplus in the US and with issue action and barrel. Stocks may be either issue stocks, modified military stocks or sporter stocks. Modified military or sporter stock forearms may not be wider or flatter on the bottom than the original stock issued for that rifle. Modified military or sporter stocks may not weigh more than the original issued stock. Any trigger and scope up to a maximum of 6 power may be used. Glass bedding is allowed. The barrel may be shortened to a minimum of 20 inches unless that rifle was issued as less then 20 inches.

I would have to say no, but I am no longer a match director, so someone else needs to look at this. 

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Ken Campbell Iowa posted this 30 December 2022

no dog hunting here ... but an advisory thought...

i believe the most significant " unfair advantage " from a new liner job would be a possible

* better chamber * ...

********************

i believe a match chamber ( or even a good SAAMI job )  in an old military barrel is better than a typical military chamber in, say, a Lilja barrel ...

...and for the same reason, a " set back and rechamber " of the military barrel can be an advantage .

just some thoughts ... ken

 

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Premod70 posted this 31 December 2022

Thanks Gents for the clarity. I asked as the thought crossed my mine and my searches on the forum gave me no direction. Now I know and appreciate all the answers.

Forrest Gump is my smarter brother.

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Bud Hyett posted this 30 December 2022

Eventually, any barrel will wear out. Surplus barrels are available, they will be probably now be set up with  a commercial reamer.

There is also the factor of the control of the groove and land depth in these barrels. (I have a Smith-Corona barrel with a .301 land and .310 groove depth. I'll be busy this Spring lapping a mold to fit.) 

We get rifles that were rebarreled at arsenals in peace time when the pace is slower and the chambers could rival commercial production. 

I do not think we should allow the newly made Criterion barrels from the CMP as substitutes, but any surplus military barrel should be allowed.  

I also think we might be beating a dead horse as the skill of the shooter for judging wind and mirage will outweigh any advantage of the rebarreled chamber.

Farm boy from Illinois, living in the magical Pacific Northwest

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