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LM4 Tear Down Guide


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#1 dobey

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Posted 04 June 2012 - 09:15 AM

This is how I tear down the LM4, do so at your own risk, and be aware that following this guide will void your warranty.

Be sure the bolt is closed and start by lightly tapping this pin out:

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Be aware that the pins are trapped, they will not come out all the way.  When the pin is fully pushed out the rear of the receiver will open like this:

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Pull the charging handle out and the bolt will come with it:

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Next I gently tap out the front receiver pin:

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Now the upper and lower receivers can be separated, note the pins are still in the lower receiver, they are not meant to be removed.

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You can see how much crap is in the hop up rubber already, this gun really needs to be cleaned allot to keep it working correctly.

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Push the delta ring to the rear to remove the upper and lower hand guards:

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Gently tap the two pins out of the front sight/gas block to remove that from the outer barrel:

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It will then slide off:

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Heat up the Delta ring with a hair drier to loosen the thread locker that is keeping the nut tight, then use an armorers wrench to remove the delta ring:

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#2 dobey

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Posted 04 June 2012 - 09:20 AM

Remove these two set screws and pull the hop unit/inner barrel free:

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Gently push this clip off and sliding the brass piece to the left:

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Next slide this piece to the left:

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Now remove the two clips carefully from the inner barrel:

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Now the metal sleeve can be slide to the left off the hop rubber:

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The hop rubber can now be removed:

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All the parts in order removed from the inner barrel:

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#3 dobey

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Posted 04 June 2012 - 09:25 AM

Now the bolt:

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Push this piece out gently from the inside like so:

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Slide it back a bit and remove:

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This groove on the inside is something that I would polish as best you can, I will go over this in my Mods thread:

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This small cir-clip needs to be removed next, careful don't lose it!

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Now the nozzle can slide out the front of the bolt:

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#4 Raptor72

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Posted 04 June 2012 - 09:39 AM

Well done man!  This will be a huge help to those who have not yet performed a full teardown.

#5 xKingSizex

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Posted 04 June 2012 - 09:52 AM

Another good post!

#6 BoobieM4H

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Posted 04 June 2012 - 11:11 AM

Thanks dobey for posting this..I've been trying to get around to doing this but have been busy trying to upgrade my gun haha..this is very helpful and detailed..great job!

#7 gcw360

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Posted 04 June 2012 - 11:26 AM

Awesome as always!

#8 Outlaw1995

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Posted 04 June 2012 - 11:31 AM

Looks like I'm not needed anymore... :(

great work dobey.

#9 aaps59

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Posted 04 June 2012 - 11:37 AM

Looks beautiful! Il definitely be referring to this in the future

#10 Tech-D

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Posted 04 June 2012 - 02:53 PM

Thanks Dobey, I'll be referencing this soon.  Great job.

#11 gcw360

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Posted 04 June 2012 - 03:49 PM

Pinned....

#12 Nitemare

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Posted 04 June 2012 - 04:29 PM

How exactly do you/should you remove the circular clip that is holding the cylinder in place? I'm going to sand down the cylinder and file down the bolt as you did tomorrow so that I don't have issues anymore with it returning all the way.

#13 dobey

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Posted 04 June 2012 - 04:49 PM

I just push it off with a flat tip screw driver.

#14 Guest_Allizard_*

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Posted 04 June 2012 - 05:26 PM

Thank you Dobey!!

#15 BoobieM4H

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Posted 04 June 2012 - 08:54 PM

View Postdobey, on 04 June 2012 - 04:49 PM, said:

I just push it off with a flat tip screw driver.

View PostAllizard, on 04 June 2012 - 05:26 PM, said:

Thank you Dobey!!
becareful tho..ive almost lost it a few times..itll snap right off. i put like a cloth or rag behind it and pry the clip towards it.

#16 niko_gpsy

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Posted 05 June 2012 - 02:36 PM

Even if you lose the "E" clips these can be readily found at RC hobby shops.  I have a drawer full of these from my RC building days in various sizes.

#17 Guest_Rumble_*

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Posted 05 June 2012 - 04:09 PM

Nice post Dobey.

#18 Nitemare

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Posted 05 June 2012 - 04:42 PM

I've been prying at this circular clip for a good 20 minutes with micro screw drivers and it is not coming off... There is not enough room to fit the head of the driver between the bolt carrier and the clip to pry at it.

#19 CHEEKSx36

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Posted 05 June 2012 - 04:47 PM

Thanks for the write up! This is my first gbbr and it definitely helps a lot. How long did you hear up the delta ring for?

#20 dobey

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Posted 05 June 2012 - 04:47 PM

With two small screw drivers put one on each side of the clips open end and push it at the same time so it doesnt turn.  It helps allot if you cah clamp the bolt carrier in a padded vise.




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