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NC, USA
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Posted: 8/21/2021 6:35:25 PM EDT
Good afternoon,
I understand people use shin stock to bed barrel extensions. I have not mic’d receiver however, I’d guess there’s no more than .004 between it and my extension. I’ve got loctite 680 and it can be used to fill voids up to .016. The temperature range is 350 degrees. I’m wondering if anyone has used only loctite to bed barrel extension? |
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FL, USA
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Posted: 8/21/2021 9:26:00 PM EDT
[#1]
do you mean sticking a piece in between the barrel extension and inside the upper or a circular thin washer like shim under the barrel nut? the way i know about bedding the barrel and upper is to use a tool to true the face of the upper. then use loctite to fill between the barrel extension and upper, the area where the extension slides inside the upper, then torque the barrel nut on. the threads are not loctited
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Posted: 8/21/2021 10:03:53 PM EDT
[#2]
I always use blue loktite between the receiver and barrel extension.
NOT the threads for the barrel nut |
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Posted: 8/21/2021 10:44:15 PM EDT
[#3]
I think he mean around the diameter of the barrel extension. I go for a thermal tension fit myself.
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NC, USA
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Posted: 8/22/2021 4:51:34 AM EDT
[#4]
Quote HistoryOriginally Posted By CNC_Guy: I think he mean around the diameter of the barrel extension. I go for a thermal tension fit myself. Yes, this is what I’m talking about. Thermal tension would be better no question. Not trying to be tight but if loctite can serve the same purpose, I wasn’t going to spend 20 bucks for a piece of 1x3x.001 shim stock lol. The smallest I’ve found locally is .005. |
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Posted: 8/22/2021 4:59:43 AM EDT
[Last Edit: K1LLD33R]
[#5]
Quote HistoryOriginally Posted By Ih784: Yes, this is what I’m talking about. Thermal tension would be better no question. Not trying to be tight but if loctite can serve the same purpose, I wasn’t going to spend 20 bucks for a piece of 1x3x.001 shim stock lol. The smallest I’ve found locally is .005. https://www.brownells.com/gunsmith-tools-supplies/sight-scope-installation-tools/scope-shims/kit-no-ac-24-steel-shim-stock-prod589.aspx This is what I used, gives you a selection of thicknesses for this project and most others down the road, I was able to cut two shims from a single rectangle piece ETA Was also an excellent tool for finding the thickness needed to order a few takedown pin shims from triggershims |
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NC, USA
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Posted: 8/22/2021 5:50:02 AM EDT
[#6]
Quote HistoryOriginally Posted By FlowersForFoes: https://www.brownells.com/gunsmith-tools-supplies/sight-scope-installation-tools/scope-shims/kit-no-ac-24-steel-shim-stock-prod589.aspx This is what I used, gives you a selection of thicknesses for this project and most others down the road, I was able to cut two shims from a single rectangle piece ETA Was also an excellent tool for finding the thickness needed to order a few takedown pin shims from triggershims I seriously doubt I’ll ever use anything over .002. 20 bucks plus shipping for at the most two pieces of metal smaller than an aluminum can isn’t happening. If I could find some local I might do it. At least one guy has used just loctite. I’ll do that and see what happens. |
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Posted: 8/22/2021 6:57:10 AM EDT
[#7]
Quote HistoryOriginally Posted By Ih784: Yes, this is what I’m talking about. Thermal tension would be better no question. Not trying to be tight but if loctite can serve the same purpose, I wasn’t going to spend 20 bucks for a piece of 1x3x.001 shim stock lol. The smallest I’ve found locally is .005. Send me your address-----I'll mail you a piece of .0011 stainless,enough for a couple builds. |
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NC, USA
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Posted: 8/22/2021 8:47:18 AM EDT
[#8]
Quote HistoryOriginally Posted By DanaHillen: Send me your address-----I'll mail you a piece of .0011 stainless,enough for a couple builds. Awesome, Thank you so much! |
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Posted: 8/24/2021 12:24:34 PM EDT
[#9]
I have used Loctite 620 and 609 to bed barrel extensions in upper receivers. After torqueing the barrel in place I point the upper muzzle down and let it sit 24 hours to cure. Make sure none of the Loctite seeped inside the upper receiver.
Placing a lamp next to the upper will apply light heat and help the curing process. |
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NC, USA
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Posted: 8/30/2021 4:32:29 AM EDT
[#10]
I used the shim stock that was sent to me and heated up the receiver. It was a perfect fit. I helped the barrel/shim slide in by using 680.
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TX, USA
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Posted: 8/30/2021 5:21:30 AM EDT
[#11]
I've done it, very hard to get the barrel out later if you ever want to.
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Posted: 8/30/2021 6:04:47 AM EDT
[#12]
use a 1" wooden dowel inserted into the receiver and pound it out
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Posted: 8/30/2021 6:38:10 AM EDT
[#13]
Quote HistoryOriginally Posted By Ih784: I used the shim stock that was sent to me and heated up the receiver. It was a perfect fit. I helped the barrel/shim slide in by using 680.  |
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Posted: 8/30/2021 7:38:13 AM EDT
[#14]
If you want to do it and I mean do it.
Skim JBWELD. It won’t breakdown like the locktite can. |
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Posted: 9/12/2021 8:48:56 AM EDT
[#15]
I have used "just" loctite, and have been very happy with the results. I also lap the upper receiver face every time, prior to the Loctite.
IMHO, at the very least, the barrels seem to have less flyers, and tighter groups with a larger variety of factory loads. And I will second "borderpatrol's" comments. |
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Posted: 9/12/2021 4:32:51 PM EDT
[#16]
Quote HistoryOriginally Posted By DanaHillen: Quote HistoryOriginally Posted By DanaHillen: Originally Posted By Ih784: I used the shim stock that was sent to me and heated up the receiver. It was a perfect fit. I helped the barrel/shim slide in by using 680. @danahillen where did you pick up the shim stock? Have several builds on the back burner and looking to get some. Perhaps that multipack from Brownells is the way to go since I have both AR15’s and AR10’s waiting to be built. |
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USA
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Posted: 9/12/2021 4:49:05 PM EDT
[#17]
I used to buy or order, I think I had to order, 12" feeler gauge blades off the Snap-On truck. I cut them to custom lengths and wrapped cloth tape for handles to adjust motorcycle valves. Also bought a .0015 blade to use for thin shim stock.
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Posted: 9/12/2021 5:58:59 PM EDT
[#18]
Quote HistoryOriginally Posted By BBTC_MH: @danahillen where did you pick up the shim stock? Have several builds on the back burner and looking to get some. Perhaps that multipack from Brownells is the way to go since I have both AR15’s and AR10’s waiting to be built. I bought it from ebay..........I just looked and it's no longer listed. I still have a long strip 6" wide........send your address and I'll mail ya some.....  @BBTC_MH |
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MS, USA
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Posted: 9/13/2021 11:55:36 PM EDT
[Last Edit: MS556]
[#19]
Quote HistoryOriginally Posted By BBTC_MH: @danahillen where did you pick up the shim stock? Have several builds on the back burner and looking to get some. Perhaps that multipack from Brownells is the way to go since I have both AR15’s and AR10’s waiting to be built. Go by a local automotive or industrial machine shop. Talk to a machinist. They always have very thin .001", .0015" and .002" shim stock. Chances are they will just give you a few strips or sell to you for next to nothing. That's how I sourced mine. |
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Posted: 9/21/2021 2:52:33 AM EDT
[#20]
As far as heat goes; your barrel extension will never, ever get close to 350 degrees, so you do not need to worry about that part.
We were testing aluminum barrel nuts on an M16 and after 120 rounds through two D60 drums, the barrel nut only gained 8 degrees of temperature. Not an area that gets very hot at all. .004" is really pretty tight, but if you can shim it, do that and then use some Loctite. Never use thread locker on the threads, though(I know it's said here a lot, but people so do it!). Good luck and if you shoot before and after shimming the barrel, it would be neat to see your results! |
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Posted: 10/27/2021 3:02:36 PM EDT
[#21]
I've been desperately looking for some shim stock as well but I don't remember the thicknesses that I need and my digital calipers died unfortunately. Seems everywhere is wanting crazy prices. The most important for me is my Grendel barrel. Already had the upper trued at Paladin bmachine shop years ago.
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Posted: 10/29/2021 7:10:17 PM EDT
[Last Edit: snakeyes711]
[#22]
I've been wanting to do this for a while now. I do have some. 002" starrett shim too. Is that too big?
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Posted: 10/31/2021 9:25:03 AM EDT
[#23]
Quote HistoryOriginally Posted By snakeyes711: I've been wanting to do this for a while now. I do have some. 002" starrett shim too. Is that too big? Measure both the barrel RE OD and the upper ID... then divide in half to find what shim size you need. IE .002 shim means a total of .004 when accounting for both sides of the barrel RE. |
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