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Posted: 7/18/2022 2:01:42 AM EDT
[#1]
I don’t know how hot the barrel extension will get, but I’ve used shims in the past in lieu of the loctite and have had nothing but good things to say about the uppers’ accuracy after doing so.
ETA: bonus is that the shims aren’t a permanent mod in case you change the barrel later on. |
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Posted: 7/18/2022 7:20:44 AM EDT
[#2]
I have done it on several of my uppers and it works great. Also note that BCM uppers are all undersized and are the tightest fit possible so you could go that route also as they are really good option. I have several of those too.
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Posted: 7/18/2022 8:51:27 AM EDT
[#3]
Precision and mag dumps are not compatible IMO. Nothing burns out a throat faster than a few mag dumps and you’ll never see a barrel of mine being mistreated in such a way.
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Posted: 7/18/2022 9:22:06 AM EDT
[#4]
With current prices, if you can afford to do "mag dumps" you can afford to grab a cheap PSA upper to do them with. Don't burn up your good barrel
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Posted: 7/18/2022 11:13:01 AM EDT
[#5]
I normally shim, but hold the shim in place with green loktite.
That way, the shim stays with the barrel when removed. But in this next build am looking at either plating up the OD of the barrel extension, or building up the ID of the reeiver with KalGuard GunKote, which is extremely hard. But also agree with Big Bore, that it's not wise to do mag dumps on a precission rifle, unless you want it to shoot like a precission AK 
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Posted: 7/18/2022 11:20:00 AM EDT
[#6]
Quote Historyunless you want it to shoot like a precision AK I wish I had said that. Excellent! |
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Posted: 7/18/2022 11:32:16 AM EDT
[#7]
Cant comment on the possible heat issues, but I do bed my barrels with Loctite after I face the receiver.
I think it helps. All thing considered I would just prefer to have an undersized receiver, but I dont. |
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Posted: 7/18/2022 2:55:30 PM EDT
[#8]
FWIW... I Loctite in my barrels and lap the uppers face. I have also fired many, many rounds in an afternoon.
I don't get the barrel crazy hot, but it is certainly hot. I don't ever mag dump routinely, but I also feel it is important to test for precision at rather brisk speeds. Looking for any accuracy issues at a brisk pace.... heat included. I tend to ( at the bench ) fire, get back on target, fire, get back on target, fire, get back on target...etc for 10 rds. Observe the group, load another 10rds and give it another 10. Shooting sessions are 20mins at my local range, with a 10min fetch your target / setup your target time. I rarely allow for much cool down during these test periods. That said, I haven't noticed any long term accuracy degradation ( Loctite wise ) from the heating generated. I am sure it accelerates the barrel wear... but, again, It is important for me to know what I can expect from my barrel / AR. I hope that helps a little. I wouldn't worry one bit about an occasional mag dump. FWIW, I still Loctite and Lap every upper I assemble... after many, many "builds". |
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Posted: 7/18/2022 10:43:00 PM EDT
[#9]
It takes a mapp gas torch, and serious elbow grease, to separate parts attached together with Loctite 620. I’ve used it to attach and index FAL flash hiders and various suppressor mounts.
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Posted: 7/18/2022 10:48:07 PM EDT
[#10]
Quote HistoryQuoted: I don’t know how hot the barrel extension will get, but I’ve used shims in the past in lieu of the loctite and have had nothing but good things to say about the uppers’ accuracy after doing so. ETA: bonus is that the shims aren’t a permanent mod in case you change the barrel later on. Good excuse to just build another upper 
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Posted: 7/19/2022 1:28:57 PM EDT
[#11]
Quote HistoryQuoted: Good excuse to just build another upper This is actually the answer for any issue, even women problems 
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Posted: 7/19/2022 9:36:19 PM EDT
[#12]
Use BCM uppers requiring thermal fit or use shims. With those two better options, I do not get why anyone would want to use loctite?
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Posted: 7/20/2022 11:55:16 PM EDT
[#13]
Use 603, the heat is not issue as you are using it to fill a void. Make sure your “filling” it. A mag dump “which I would do on a precision build anyway” might soften it but enough to cause it to leak. After 603 is cured it will “soften “ w heat but still stay in place and keep tolerances tight. I would recommend lapping the upper and barrel seat as well. I used to use lapping tools before my lathe. This makes A HUUUGE difference in accuracy alone. I “blueprint” or accurize all of my custum builds for customers now. Good luck… friends dont let friends mag dump nice guns!!! Lol
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Posted: 7/20/2022 11:56:10 PM EDT
[#14]
^^^ I meant I would “not” do in first sentence
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Posted: 7/29/2022 10:28:26 AM EDT
[#15]
Just use shims. Very thin shim stock is cheap and can do several barrels. Square the upper face. Try fit the barrel. It might not need shims or green loctite, anyway.
I'll join the chorus by saying don't destroy the throat of a match barrel with mag dumps. If it needs high rate of fire because it is being used in real defense, do what you have to do and replace the barrel. Honestly, I can't envision a real world civilian defense scenario where mag dumps would be useful. Its not like you would be called on to lay down suppression fire to support someone else. |
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