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stripped lm4 and 2 tiny springs fell out


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#1 Travis T-rex Carver

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Posted 19 March 2014 - 09:09 PM

So i just got an lm4 today used. I knew the nozzle was an issue already and am going to replace that. Well it was so stuck I had to force it out and destroy it but it was screwed up anyway. Well I began to strip the lower to clean it as it was super nasty. While doing so i noticed a tiny spring sticking out by the trigger but it was loose. i pulled it out no problem and a second one fell out. The gun when assembled dry fires fine and nothing seems to be missing. Any ideas?? they looked like they were just laying inside the gun under the firing mech.

#2 Morxis

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Posted 19 March 2014 - 10:06 PM

Could be your detent spring for the selector pin. Only other small spring i can think of is the small one for the bolt release.

#3 General Pickle

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Posted 20 March 2014 - 01:07 AM

Take some pictures and post them here, that way we can help you identify what may be missing or problematic.

#4 Chuck S

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Posted 20 March 2014 - 03:02 AM

Compression (coil) spring?  How far did you disassemble?  Pull the pistol grip off?  The stock?

The selector detent and spring are held in by the pistol grip on the actual M4 carbine.  They don't show in the LM4 parts diagram at all but that's the logical place for them to be and the little coil will stick out behind the trigger and usually fall out. The detent usually stays inside retained by the lubricant.

The selector detent (plunger) pin not only limits rotation it also retains the selector in the gun.

There's another similar (perhaps identical) spring holding the rear takedown pin in the gun.  That's secured by the receiver end plate which is removed with you remove the stock.

Both are vital parts.

-- Chuck

Edited by Chuck S, 20 March 2014 - 03:07 AM.


#5 -wigs-

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Posted 02 April 2014 - 06:57 PM

Sounds like pieces cane from a broken nozle return spring




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