Heat gun on delta ring
Posted 30 September 2012 - 06:51 AM
As per the previous posts, I understand that I need to heat up the delta ring to soften the locktite. I will be using a heat gun, but before I do this, wouldn't this damage any parts inside, like the rubbers and the inner barrel? Any tips on how long to heat it up and where to concentrate the heat?
Posted 30 September 2012 - 07:13 AM
Posted 30 September 2012 - 07:21 AM
A heat gun at high settings will certainly melt plastic and rubber parts so start low. A hair dryer may be a safer choice.
Posted 30 September 2012 - 07:42 AM
I was able to turn the delta ring with my ar wrench without any heat applied. Just be sure to secure the right spot of the upper into the vice, and you should be good to go.
Posted 30 September 2012 - 09:33 AM
The barrel nut is that castled nut under the handguards you use the barrel wrench or "armorers tool" to turn. It may be locktited in the LM4 but there's certainly no need for it as the barrel nut is secured by the gas tube in the top notch. The gas tube is pure decoration, though, and if you decide to not put it back check the barrel nut from time to time to be sure it hasn't loosened or apply a small amount of Blue Locktite.
Not sure how KWA does this in their maintenance shop. I'd try gripping the upper receiver by hand with a towel and have someone else apply heat and the barrel wrench.
The upper receiver is not monolithic like the M16 so be careful how you secure it. You can twist the whole receiver apart I imagine. Standard M16 receiver blocks will not work, the LM4 receiver is larger and the blocks will not close.
The preferred method of removing the barrel nut on the real M4 Carbine is to secure the barrel with barrel blocks, not the receiver. But airsoft construction is different.
Edited by Chuck S, 30 September 2012 - 09:34 AM.
Posted 30 September 2012 - 10:43 AM
I tried clamping on the upper receiver, but it was not good because if I put enough force it looked like I could destroy that upper. So I took Outlaw1995's advise and put the upper and the lower together and clamped on the point where the front pins are, this seems to be the most secure way of doing it, but I still didn't get the barrel nut off because I backed off immediately as I started to hear these funny creaking noises like something was about to break.
I checked the receiver and no cracks so far, just a lot of scratches with the vice eating through the towels due to all the torquing. And yes, I was turning it counter clockwise.
I may need to call a buddy (or two) to give me a hand at this because like what ChuckS said somebody has to stabilize the receiver, and somebody has to pull the delta ring back and another to put some muscle on the armorer's wrench to get the barrel nut off.
So for those who were able to take this thing off alone, I salute you.
Thank you all for the tips and I shall report back once I finally conquer this newly found archenemy.
Posted 30 September 2012 - 11:18 AM
I've even seen a video where a guy uses a cutting tool to literally CUT the delta ring off... o-O
Sorry for making you type the explanation Chuck, I know the difference between the two, I just wanted to "simplify" the matter. haha
Posted 30 September 2012 - 11:31 AM
Posted 30 September 2012 - 01:26 PM
The receiver block method is not recommended for the M16/AR15 as it puts unnecessary torque on the upper receiver. But the preferred barrel block method method doesn't look real good for airsoft either!
I've not removed my barrel nut but I assume KWA did last week when they worked on my hop up.
Posted 30 September 2012 - 01:29 PM
Posted 30 September 2012 - 01:49 PM
Posted 30 September 2012 - 04:41 PM
To dremel the delta ring would be easy, I'm sure that it's made of soft pot metal, but what I'm not sure is the composition of the barrel nut, is this also pot metal? Or is it made of steel?
I'll try not to cut all the way to the receiver threads... oh the pains we are willing to go through for the love of this LM4.
Posted 30 September 2012 - 04:47 PM
Posted 30 September 2012 - 04:58 PM
Start watching at 9:00 minutes.
I do not recommend doing this procedure..... Just said it because I thought it was funny since it is technically a way of getting the delta ring off.
Posted 30 September 2012 - 05:10 PM
Hope this helps.
Posted 30 September 2012 - 05:38 PM
I was just wondering if I can take it one more notch and proceed in cutting the barrel nut as well, don't worry if I mess this up I have nobody to blame but myself. It may look like a desperate move, because it actually is due to previous failed attempts. But I will keep everybody's tips in mind and sleep on it, hopefully a fresher mind in the morning will dissuade me from this seemingly drastic step.
Posted 30 September 2012 - 05:43 PM
Posted 30 September 2012 - 06:09 PM
So heat was an assisting factor not to melt the Loctite (which was confirmed as non-existent) but to expand the barrel nut.
I shall give this another try with a heat gun (initial attempt was with a blow dryer), hopefully I'll be lucky enough to reach a temp that will coerce an expansion without melting parts inside the outer barrel.
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