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KWA LM4 PTS - Impossible Delta Ring


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#1 General Pickle

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Posted 25 May 2013 - 06:40 PM

Hey guys, finally got the tools I need to get at the internals of my LM4. I was able to install a RS Magpul ASAP with no problems, aside from the required filing. I am now ready to put my EVO II into the gun but I can't for the life of me find a way to get the delta ring off. The wrench I have is great but I can't seem to get a good grip on the upper in order to get leverage for the wrench. So far I've only had the upper assembled while doing this, all parts that I could take off have been removed in order to avoid damaging them.

Any help is much appreciated, thanks!

#2 BeachEMT

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Posted 25 May 2013 - 07:36 PM

Are you using a bench vice and vice block? From what I can tell they are absolutely required to remove and also properly time the LM4 barrel nuts.

#3 General Pickle

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Posted 25 May 2013 - 09:44 PM

Didn't use a vice or block, but I managed to get it with a hair dryer and minimal force. I'm very surprised what a little heat and leverage did for me! I now have the EVO II installed and am very excited to see how it works!

#4 BeachEMT

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Posted 25 May 2013 - 10:29 PM

How long did you run the hair dryer? I had no luck when I tried it.

#5 -wigs-

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Posted 25 May 2013 - 11:11 PM

I cannot stress enough to tap the ar wrench with a hammer and NOT just crank on it after heating it up. I've never used a correct ar wrench and to fully tighten my dd barrel nut I put a flat head at an angle into one of the notches and give it a few good whacks after its hand tight.

Edited by -wigs-, 25 May 2013 - 11:14 PM.


#6 BeachEMT

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Posted 26 May 2013 - 12:26 AM

I have all the right tools except a bench vice. I've tried everything that people have said to do on this forum, including using an AR wrench and hammer, with no luck. I think I'm just going to take it into a local shop to have them do it.

#7 General Pickle

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Posted 26 May 2013 - 03:11 AM

I applied heat several times, each time thinking that it would be plenty, then I held the wrench in position and began hitting the long end of it with a plastic hammer, lightly at first and then harder until I felt I was going to damage something. When that didn't work I applied more heat, trying my best to get heat in ALL areas of the threads. Originally I tried to do it without the lower and magazine installed but I found that it was impossible to get any grip on the gun, so I left the mag and lower assembled and heated it until it was hot enough that it hurt my bare fingers, then it seemed that suddenly the threads gave away and from one fairly firm tap from my hammer the ring came loose, then it was easy as cake to get everything else. Be careful when you're tapping as the wrench may damage the delta ring slightly, though personally I don't care if it gets scratched or scraped, I just desperately wanted to get my hop-up changed out.

Getting the EVO II installed was not as easy as I thought it would be; once I got all the stock parts out I began assembling the EVO parts but I soon as I went to slide the adjustment ring back over the EVO parts it became obvious that this would be much more tricky. It might be just my gun but I found that my adjustment ring was bent slightly inward which made it tough to get the assembly back together. Also when I tried to put the spring arm on the barrel I almost bent it completely out of shape, not really sure why this happened but I was able to save it by using some pliers very carefully. Once I had figured out how to solve my issues the reassembly was a snap and everything seems to function fine. I currently only have one mag... which doesn't hold gas or have functional feed lips so I can't actually test it.The bolt locks fine, it cycles just fine, the hop up adjustment seems to work though it's a bit stiffer. All in all I'm just really happy that I finally can get inside the internals of this gun, since I've been wanting to ever since day one.

#8 thatguyx

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Posted 26 May 2013 - 10:53 AM

Nice to hear it all worked out for you. But you gotta get more mags man. Or at least one working mag

#9 General Pickle

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Posted 26 May 2013 - 01:17 PM

Yeah I know :( I was going to buy a whole bunch but then school happened... This Summer will be ideal anyway, so by then I'll have it figured out.

#10 -wigs-

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Posted 26 May 2013 - 01:56 PM

If you could get the inner out this would be a million times easier cause you could just use PBS blaster to eat the thread lock. Since you can't do that your left to heat. Pb will eat right through plastic

#11 kaihuang

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Posted 05 June 2013 - 11:15 PM

It was a pain trying to do it by myself. Then I asked a buddy to hold onto my LM4 after using a heat gun on it for 2 min, I broke torque without much effort. My problem was I could not create enough counter-torque by myself.

#12 BeachEMT

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Posted 15 June 2013 - 04:08 PM

I finally got my impossible barrel nut off. I tried everything, heat, lots of torque, etc. What ended up working really well for me was nail polish remover. I poured some on the threads from the side away from the receiver and let it soak for about an hour or so. Then it threaded off like a charm.

#13 gcw360

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Posted 15 June 2013 - 04:14 PM

View PostBeachEMT, on 15 June 2013 - 04:08 PM, said:

I finally got my impossible barrel nut off. I tried everything, heat, lots of torque, etc. What ended up working really well for me was nail polish remover. I poured some on the threads from the side away from the receiver and let it soak for about an hour or so. Then it threaded off like a charm.
Now that's an innovative approach.  Any damage to the finish that is appreciable?

#14 BeachEMT

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Posted 15 June 2013 - 08:15 PM

Surprisingly, none. I did a little swab ahead of time to check.

#15 gcw360

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Posted 16 June 2013 - 06:11 AM

View PostBeachEMT, on 15 June 2013 - 08:15 PM, said:

Surprisingly, none. I did a little swab ahead of time to check.
That's good.  Thanks for the report.

#16 The Nutty Professor

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Posted 16 June 2013 - 09:29 AM

Acetone didn't take the finish off??!!! DAMN!!!




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