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Mods To My Lm4 (Wip)


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#1 dobey

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Posted 23 May 2012 - 10:13 AM

Just got this in the shop today.   I am about to go out and take a few pictures of this stock, then I will get to work!

Edited by dobey, 23 May 2012 - 10:13 AM.


#2 dobey

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Posted 23 May 2012 - 10:56 AM

Sorry for the not so great pictures, I forgot my camera bag and only have the 55mm-250mm lens, so getting any kind of close up is out today.


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LM4 side by side with my WA M4

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LM4 Bolt (left) WA Bolt (right)

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LM4 charging handle (right) next to the Real Steel Charging handle that was modified for the WA (left)

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Lower receiver side by side (LM4 Left) (WA Right)

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The LM4 is VERY similar to my $1400.00 WA!!!

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#3 Outlaw1995

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Posted 23 May 2012 - 11:40 AM

And here we go on a wild ride of modifications!! Looking forward to the posts that follow.

#4 dobey

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Posted 23 May 2012 - 12:15 PM

First things first it gets a little micro-amp to make it louder:

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#5 gcw360

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Posted 23 May 2012 - 06:46 PM

View Postdobey, on 23 May 2012 - 12:15 PM, said:

First things first it gets a little micro-amp to make it louder:

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Face palm....Outlaw's right....hang on folks!

#6 akiraspeedstar

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Posted 23 May 2012 - 11:37 PM

O_o!? I don't know about that flas...muzzle bra......whatever that is on the front haha. Can't wait to see the finished product though.

#7 dobey

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Posted 24 May 2012 - 11:46 AM

All painted and next to the one I made for the WA:

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#8 Nitemare

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Posted 24 May 2012 - 03:29 PM

Got a sound comparison?

#9 Titan

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Posted 29 May 2012 - 08:25 PM

Looks good. Can't wait to see what's next. I have done a few mods as well I will post a few pics tomorrow.

#10 dobey

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Posted 31 May 2012 - 04:57 AM

No problems on this gun so far, last weekend was an Op and it only got a few mags (4 to 5) put through it, it performed just fine and got plenty of kills.  This weekend is a skirmish and it should see allot more action, I will tear into it after that to see if I can spot any potential problems.

At the range it was hitting fine at 175 feet (8 out of 10 shots on a 14 inch steel plate) at 200 feet it was at max range, and was all around the target but not hitting consistently.

#11 nosaj

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Posted 31 May 2012 - 02:06 PM

What bb's were you using?  I've used mine a couple of times it's not that accurate :shocked:

#12 dobey

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Posted 31 May 2012 - 03:55 PM

Matrix 0,25's from evike.  This one seems as accurate as a standard kwa aeg.  It gets a little goofy on full auto, but my WA does the same thing.  I only ever use them on semi while playing.  Be sure the clean the barrel all the time on a gas m4.  It only takes a few mags before the inside is covered in grime.

We play 2 rounds per hour and I ussually clean the barrel between rounds.  Just a quick in and out 2 times with the cleaning rod and some gun cleaning patches for a .243

Edited by dobey, 31 May 2012 - 03:57 PM.


#13 Guest_Allizard_*

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Posted 31 May 2012 - 05:44 PM

Don't forget there is a break in period.  The more you shoot, the better it gets.

#14 Guest_Hikaru_*

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Posted 01 June 2012 - 05:59 AM

I can't wait to see what you do next with the LM4 dobey!

#15 dobey

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Posted 04 June 2012 - 11:16 AM

First thing to look at is the bolt, the loading nozzle tends to stick in the extended position.  I have no doubt this is the cause of some of the failures posted on these forums, and is an issue with the WA M4 as well.  There are a few things I can see causing the issue right off the bat, first is the rough interface between the loading nozzle and the locking tab:

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A few passes with some 600 grit sand paper is all that you need here, do it to the loading nozzle and the locking tab, then slide the two parts a bit to feel how smooth it slides, sand more if needed but try not to change the shape of anything, just get it smooth:

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The next problems can come if the loading nozzle rotates slightly it can get caught on these corners:

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Lightly file here to make a ramp, it will force the loading nozzle back into its track without wearing the thing to pieces:

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It doesn't take much, a few steady passes with a file and it should look like this, don't go crazy here!

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Same thing on this point:

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Your trying to get rid of any resistance to the nozzle seating, remember this thing cycles fast, and any little snag can blow the cycle and cause things to get out of sinc (usually resulting in a miss-feed problem).

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The new ramps should help guide the loading nozzle right into its home.  This part should snap back in fast every time you pull it and let go:

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#16 nosaj

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Posted 04 June 2012 - 11:27 AM

Interesting.  I can't wait to get through my exam to check this out.  I am kind of confused on what to sand between the interface between the loading nozzle and the locking tab, maybe I just need to have the bolt assembly in my hands.

#17 dobey

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Posted 04 June 2012 - 12:29 PM

The part where the number is stamped, compare the two pictures before and after.

#18 nosaj

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Posted 04 June 2012 - 01:25 PM

Okay, thanks for the clarification!

#19 dobey

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Posted 04 June 2012 - 01:36 PM

The outer barrel is threaded right at the gas block, a little heat and it unscrews (14mm CCW).  This gun is primarily cqb (our main skirmish area is 500,000 square feet with 25 buildings and over 60 rooms) so short=good!  A quick cut and re-crown of the inner barrel and you get:

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#20 niko_gpsy

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Posted 04 June 2012 - 02:57 PM

That is sweet!  Again, nice work dobey.




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