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LM4 lower receiver material?

LM4 lower metal

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#1 Switch556

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Posted 22 May 2013 - 08:45 PM

Hey all,

I managed to break off a piece of my lower receiver popping out some pins to install a Magpul aluminum enhanced trigger guard, in lieu of buying a new lower receiver which I can't find anywhere (ahem proshop!) I want to glue the piece back on and finish the trigger guard install.

Any ideas on what metal the lower receiver is made of? I am thinking JB Weld or even just some loctite/krazy glue. Thoughts?

#2 BeachEMT

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Posted 22 May 2013 - 10:28 PM

It's aluminum. That's true for any metal bodied AR-15, airsoft or RS. You can try to bond that tab back on but I've never heard of anyone being successful. It will reattach but the bond is just too weak to hold up for very long.

#3 Chuck S

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Posted 23 May 2013 - 02:48 AM

This will maybe help the next guy:

You must support the receiver when whacking out the roll pin that secures the trigger guard to the lower receiver.  This applies to both the airsoft and cartridge models which I've also seen broken doing this.

-- Chuck

#4 akiraspeedstar

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Posted 23 May 2013 - 05:43 AM

Like beach mentioned its aluminum, JBWeld can work for a bit but it mighr break on you eventually.

Call the KWA Proshop directly, they probably have a lower.

#5 The Nutty Professor

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Posted 23 May 2013 - 05:37 PM

The only way to reattach it and it will stay is to aluma-weld or braze it. Then you have to file and recolor the part. A waste of time really. Just run it until you can find a new lower. Just my opinion.

#6 BeachEMT

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Posted 23 May 2013 - 06:03 PM

It actually might work to try to bond a magpul or other aluminium trigger guard permanently to the lower. There should be enough surface area to get a good bond.

#7 General Pickle

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Posted 23 May 2013 - 06:31 PM

This is one of the reasons I went with the Magpul edition, not just because it was sexy but also because it had a lot of stuff on it that I would have wanted such as a different trigger guard. If you have access to a welding equipment then I'd say give it a shot but really only if you know what you're doing. If you're not an experienced welder I would stick to JB weld or something like that, maybe an epoxy?

#8 BeachEMT

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Posted 23 May 2013 - 07:48 PM

I wouldn't put anymore effort into it than trying to epoxy it. The likelihood of long-term success is very low.

BTW Pickle, JB Weld is just a brand of epoxy.

#9 Switch556

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Posted 26 May 2013 - 11:05 PM

So I found out the pro shop does have lower receivers in stock, just not listed. It is a low stress area, so I'm really not concerned about actually welding it, and yes JB Weld is just epoxy, I'll probably just epoxy that entire end of the trigger guard and bond it to the rest of the receiver and the lips, etc. Thanks all.

Edited by Switch556, 26 May 2013 - 11:08 PM.


#10 Switch556

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Posted 26 May 2013 - 11:07 PM

grr double post

Edited by Switch556, 26 May 2013 - 11:07 PM.


#11 BeachEMT

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Posted 26 May 2013 - 11:08 PM

Let us know how that works out. I'm curious it you could make a PTS style lower with a magpul trigger guard and a standard PTR lower.





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