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Custom LM4 Upper

upper receiver 416 HK416 hk416 lm416 LM416 custom mod

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#81 Ash

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Posted 20 February 2013 - 11:25 PM

Hmmm, would you mind posting how you attached your's to your LM4 and what if any mods you did.  I am doing the conversion for surprise gift for a teammate and want it to be perfect.

#82 BeachEMT

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Posted 21 February 2013 - 12:15 AM

I think there are blow by blow descriptions towards the beginning of the thread but here's the quick and dirty answer:
-The barrel nut threads on with no problems, but the inside diameter must be milled out to fit a LM4 barrel
-I used Madbull Barrel Nut Shims to adjust the hop-up position and fill the void between the front of the barrel "ledge" and the nut
-I attached some custom mounts to the upper rail to interface the stock receiver mounting points
-For the "gas block" I just used the rear pin. The pin spacing is different than the LM4 barrel.

Everything else was drop in.

#83 akiraspeedstar

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Posted 21 February 2013 - 06:50 AM

Really the only large modification is the barrel nut diameter to go over the barrel. Everything else just slipped right on. Though I also tapped the upper receiver and placed a shim into the upper to ensure that the upper rail didn't move. I didn't have to use any shims for the barrel nut and the rail mounts in the correct location and the barrel holds tight, though I did end up using the OEM shim for the hell of it. As for the gas block, I just used the grub screw on the bottom to hold it in place. For me the block didn't sit in the right location when I tried to use one of the pin holes.

Here's an updated pic...

Posted Image

I'm going to start running it without the suppressor for CQB though, the AAC throws off the balance significantly and really tires out my arms. Plus it also adds another 4" or so to the overall length.

#84 ReD_FuRy_

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Posted 03 July 2013 - 10:46 AM

Hey akiraspeedstar how did you put the 614 rail on ur lm4?


Hey akiraspeedstar how did you put the 614 rail on ur lm4?


#85 BeachEMT

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Posted 03 July 2013 - 11:24 AM

As stated in the post directly above yours, he took the screw from the JG and screwed the rail onto the upper. I fabricated brackets like the OEM LM4 rail has. Both work, it just matters how much effort you are willing to put in.

#86 oswald808

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Posted 16 August 2013 - 12:04 PM

besides the upper and rail what other parts do you need for the conversion?

#87 BeachEMT

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Posted 17 August 2013 - 06:37 PM

View Postoswald808, on 16 August 2013 - 12:04 PM, said:

besides the upper and rail what other parts do you need for the conversion?
You also need a barrel nut and a good amount a machining skill. A gas block is optional if you'd like the realism.

#88 The Nutty Professor

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Posted 19 August 2013 - 09:00 AM

I know I'm being dense so let me get this straight...If I buy a complete 614 all I'll be using is the upper receiver and the RIS? The rest is all LM4 upper parts?

#89 BeachEMT

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Posted 19 August 2013 - 10:10 AM

View PostThe Nutty Professor, on 19 August 2013 - 09:00 AM, said:

I know I'm being dense so let me get this straight...If I buy a complete 614 all I'll be using is the upper receiver and the RIS? The rest is all LM4 upper parts?
Basically, yes. The only parts you need are: the upper rail, the barrel nut and the RIS. If you would like a little more realism, you can also use the gas block. Some of the parts can be found individually with a lot of searching on the Asian retail sites.

#90 The Nutty Professor

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Posted 19 August 2013 - 10:40 AM

Found the upper with your help. The barrel nut and RIS are all I need to find. Would this one work?
http://www.evike.com...oducts_id=38429

Edited by The Nutty Professor, 19 August 2013 - 10:52 AM.


#91 BeachEMT

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Posted 20 August 2013 - 07:11 AM

No, you want this one: http://www.wgcshop.c...416&catid=&cat=
The JG is a multi-piece receiver that is very similar in design to the KWA receiver. Akira basically just took the JG rail and dropped it onto the LM4 upper. It's not the most secure way to do it, but it works.

Here's the RIS: http://www.evike.com...oducts_id=30726

I have yet to find the barrel nut or gas block for sale individually, but I'm sure it's only because I haven't looked hard enough.

#92 The Nutty Professor

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Posted 20 August 2013 - 11:45 AM

I looked hard for the barrel nut. The gas piston and block is window dressing I'll find it if I can. Ok it's all window dressing just to what degree.

Edited by The Nutty Professor, 20 August 2013 - 11:46 AM.


#93 BeachEMT

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Posted 20 August 2013 - 10:52 PM

You may be able to use a VFC barrel nut, but I can't confirm that.

#94 jet

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Posted 28 August 2013 - 06:17 AM

First off thank you to Beach and Akira for leading the way on this mod.

Been looking for a JG 416 for weeks and suddenly one just showed up local on CL. The seller didn't even know it was JG. Great condition.

In regards to opening the JG barrel nut ID. Wasn't that hard to do. I used a JET lathe, 3-jaw chuck and a boring bar. 3 passes and it was done. Total of 15 minutes (I'm a slow non-pro machinist) including setup. The nut cut easily. It's a soft aluminum.

Beach can you give more details and/or pics on how you fabricated the mounting brackets for the JG upper reciever rail.
Did you cut the brackets off the LM4 rail or did you make completely new ones? Did you make both front and middle rail brackets?
Thanks in advance for your info.

Can't wait to get this all together

#95 BeachEMT

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Posted 28 August 2013 - 08:23 AM

Give me about 30 mins and I think all your questions will be answered. B)

Edit: the guide is up- http://www.kwausa.co...showtopic=11699. Hopefully I answered your questions. If any one has any questions, please ask them in that thread. I am more than happy to help.

Edited by BeachEMT, 28 August 2013 - 09:30 AM.






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