AR15.Com Archives
 where to buy AR barrel shims
blueheeler66  [Member]
3/30/2006 1:46:33 PM
I've done a pretty good internet search with very limited results. The only place I can find them is at AR15 barrels.com which I don't have a problem with buying from. But if someonee else sold them also, maybe I could do some one-stop shopping instead of paying shipping for half a dozen different items from half a dozen different places. Thanks.
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TANGOCHASER  [Team Member]
3/30/2006 3:45:23 PM
What shims are you talking about for the barrel?
M4Madness  [Team Member]
3/30/2006 6:12:25 PM

Originally Posted By TANGOCHASER:
What shims are you talking about for the barrel?



He's talking about shims that fit behind the barrel nut. 99% of the time they are not needed. I'd only use them if I couldn't get my barrel nut indexed between 30 and 80 pounds.
Homeinvader  [Member]
3/30/2006 6:32:36 PM

Originally Posted By M4Madness:

Originally Posted By TANGOCHASER:
What shims are you talking about for the barrel?



He's talking about shims that fit behind the barrel nut. 99% of the time they are not needed. I'd only use them if I couldn't get my barrel nut indexed between 30 and 80 pounds.



I think he's talking about indexing shims for a flash hider or muzzle brake. Never heard of using shims with a barrel nut.

You can get indexing shims from Brownells and a few other places. Anyone that makes a brake usually has these available for fitting their brake to your barrel. Many brakes come with a set too.
M4Madness  [Team Member]
3/30/2006 6:36:50 PM

Originally Posted By Homeinvader:

Originally Posted By M4Madness:

Originally Posted By TANGOCHASER:
What shims are you talking about for the barrel?



He's talking about shims that fit behind the barrel nut. 99% of the time they are not needed. I'd only use them if I couldn't get my barrel nut indexed between 30 and 80 pounds.



I think he's talking about indexing shims for a flash hider or muzzle brake. Never heard of using shims with a barrel nut.



www.ar15barrels.com/data/barrel-nut-index.pdf
Quarterbore  [Team Member]
3/30/2006 6:45:26 PM
No, he is trying to sight in his gun and the sandbags just are a little too low...

I use these:



They will last a LONG time
Homeinvader  [Member]
3/30/2006 9:46:35 PM

Originally Posted By M4Madness:

Originally Posted By Homeinvader:

Originally Posted By M4Madness:

Originally Posted By TANGOCHASER:
What shims are you talking about for the barrel?



He's talking about shims that fit behind the barrel nut. 99% of the time they are not needed. I'd only use them if I couldn't get my barrel nut indexed between 30 and 80 pounds.



I think he's talking about indexing shims for a flash hider or muzzle brake. Never heard of using shims with a barrel nut.



www.ar15barrels.com/data/barrel-nut-index.pdf



Well I learned something today. Not sure I'd use shims to solve that problem, just get another barrel nut that works better, but good to know. Thanks a lot.
556Cliff  [Member]
3/30/2006 10:15:46 PM

Originally Posted By M4Madness:

Originally Posted By TANGOCHASER:
What shims are you talking about for the barrel?



He's talking about shims that fit behind the barrel nut.



Just FYI, you don't want to put those shims behind the barrel nut, if you do they will spin and crunch up like aluminum foil. You want to put them on the other side of the barrel extension flange, the side with the indexing pin, you must remove a 1/16" slice from the shim so that it fits around the index pin.

Those are the current instructions that Randall gave me.



BTW, be careful with those shims because they are THIN.
TANGOCHASER  [Team Member]
3/30/2006 10:40:21 PM
In 24 years of playing with AR15s, I have never heard of needing shims to align the barrel.
blueheeler66  [Member]
3/31/2006 12:18:38 PM
Nope. Barrel nut shims or gas tube timing shims; whatever you want to call them.
Have a varmint barrel and I don't care to put an assload of torque on the reciever to get it to time for the gas tube to go in. It'll take 80+ ft.lbs to get it to except the tube and less than hand tight for the other way.
Teknic  [Dealer]
3/31/2006 12:34:53 PM
When you torque it down, make sure to tighten and loosen a few times and then torque down to get the correct foot lbs.

Homeinvader  [Member]
3/31/2006 12:44:14 PM

Originally Posted By blueheeler66:
Nope. Barrel nut shims or gas tube timing shims; whatever you want to call them.
Have a varmint barrel and I don't care to put an assload of torque on the reciever to get it to time for the gas tube to go in. It'll take 80+ ft.lbs to get it to except the tube and less than hand tight for the other way.



While I hadn't heard of this either until now, I would definitely just get yourself a new barrel nut. Less hassle, probably cheaper and I cannot imagine a barrel shim doing anything neutral or positve for accuracy. You don't want to try to make an improperly fitting barrel work, just get one that fits properly. They're too cheap to bother with this method.
blueheeler66  [Member]
3/31/2006 3:30:42 PM
Just experimenting. Using a LaRue rail with the LaRue barrel nut; getting another I imagine would be iffy at best I'm thinking. Read the thread about the DMRs and thought this might be a good thing. The barrel fits fine, it's the loose torque or high torque that has me doubting if I could be getting a little more accuracy out of it. Right now, it's 85 ft.lbs to get the barrel nut to line up for the gas tube; 30 ft. lbs puts the gas tube web right in the middle of where you don't want it. Did the 3 torque & unscrew sequences before going for the final line-up first off btw.
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