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Finished LM4 Project


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#1 niko_gpsy

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Posted 13 June 2012 - 02:28 PM

Finally done with my LM4!!!

Parts List

1. Madbull Daniel Defense 7" rails (no mods required)
2. Magpul Mbus rear site
3. Magpul MOE+ grips (no mods except a washer required)
4. ACE Skeleton stock (slight mod required)
5. Real steel buffer and spring (Gives harder recoil without the risk of damage like the "angry gun" kit)
6. Sixell magwell grip
7. JP Rifle flash hider
8. Magpul trigger guard


I polished the bolt and sprayed the exterior down with Super Lube Dri-film along with the charging handle and boy is it smooth!!


Posted Image


Posted Image

#2 BoobieM4H

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Posted 13 June 2012 - 02:44 PM

Lookin good!

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#3 D1CTATOR

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Posted 13 June 2012 - 02:48 PM

Looks awesome, great job!

#4 Outlaw1995

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Posted 13 June 2012 - 03:20 PM

Nice build dude!!

#5 gcw360

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Posted 13 June 2012 - 04:23 PM

Great build thanks for the inspiration!  As you know Niko, I am taking a path less traveled with mine if all goes well....

#6 Boss302

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Posted 13 June 2012 - 04:30 PM

Nice, where did you get the buffer and spring?

#7 sheepdogg

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Posted 13 June 2012 - 05:35 PM

Considering the same rail how easy was the install and if you have the time mind sending a how to?

#8 Jatodude

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Posted 13 June 2012 - 05:35 PM

Care to elaborate on the "slight mod" for the ACE stock?

It's my favorite LM4 that I've seen yet.  It reminds me of Allen's post on the M4 picture gallery years ago.  I'm not a fan of the front sight post, but it's a clean looking gun...

Is that a chrome bolt?! 0.o

#9 niko_gpsy

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Posted 13 June 2012 - 05:37 PM

The buffer and spring can be purchased for another $15 but these were specifically for the A2 buffer tube because they are longer than the ones on the stock retractable.

FYI.....I just changed the o-ring in my LM4 to a Danco #10 and it increased fps with 0.25 from around 350 to 370. Also I no longer have problems with bbs dropping off from loss of compression in full auto.

#10 niko_gpsy

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Posted 13 June 2012 - 05:45 PM

View PostJatodude, on 13 June 2012 - 05:35 PM, said:

Care to elaborate on the "slight mod" for the ACE stock?

It's my favorite LM4 that I've seen yet.  It reminds me of Allen's post on the M4 picture gallery years ago.  I'm not a fan of the front sight post, but it's a clean looking gun...

Is that a chrome bolt?! 0.o

The cut out on the lower receiver where the sling adaptor slips into like a peg is oblong on the gun but the ace stock was circular. I had to dremel the circular protrusion into an oblong shape so that it would fit the hole on the lower receiver.

The bolt is a polished stock KWA one. But polishing it made the bolt action much smoother. :)

#11 R_King91303

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Posted 13 June 2012 - 05:47 PM

View Postniko_gpsy, on 13 June 2012 - 05:37 PM, said:

The buffer and spring can be purchased for another $15 but these were specifically for the A2 buffer tube because they are longer than the ones on the stock retractable.

FYI.....I just changed the o-ring in my LM4 to a Danco #10 and it increased fps with 0.25 from around 350 to 370. Also I no longer have problems with bbs dropping off from loss of compression in full auto.

...would that o-ring be part 190 or 191?


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#12 Jatodude

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Posted 13 June 2012 - 05:52 PM

Thanks for the O-Ring tip!

#13 niko_gpsy

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Posted 13 June 2012 - 05:52 PM

View Postsheepdogg, on 13 June 2012 - 05:35 PM, said:

Considering the same rail how easy was the install and if you have the time mind sending a how to?

Here's a step by step

1. Take flash hider off. You may need a heat gun.
2. Take hand guard covers off
3. Punch out the 2 pins under the sight mount using a roll punch then the 2 pins holding the sling adaptor
4. Slide the sight mount off toward the front
5. Take the delta ring off using an armorers wrench. You can use a heat gun on the ring but I didn't want to because of bucking and luckily I didn't have to
6. Unscrew the delta ring off.
7. Slide the Madbull DD rail retainer in first then use the barrel but it comes with to secure it.
8. Then the rail goes on and the kit comes with 6 hex screws that you use to secure the rail to the retainer.

This may sound a bit much right now but once you start it will all make sense and you will see how straight forward this is. ;)

#14 Boss302

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Posted 13 June 2012 - 05:57 PM

What exactly is a Danco # 10?

#15 Jatodude

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Posted 13 June 2012 - 05:59 PM

Danco #10 is an O-Ring to replace part number 191, the piston O-Ring.

You should post some close ups of the bolt and a video of that thing shooting :)

#16 niko_gpsy

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Posted 13 June 2012 - 06:01 PM

View PostR_King91303, on 13 June 2012 - 05:47 PM, said:


...would that o-ring be part 190 or 191?


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It's part 191. Didnt think that it would have this kind of effect and was even thinking of changing the 190 ring. But I don't I will now since it definitely resolved my full auto issue with bb dropping off prematurely.

#17 niko_gpsy

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Posted 13 June 2012 - 07:05 PM

View PostBoss302, on 13 June 2012 - 05:57 PM, said:

What exactly is a Danco # 10?

Danco is a manufacturer of o-rings and they number their o-rings of different sizes for easier identification. So it's easier to go to a hardware store and ask for a danco#10 instead of 23/34" x 5/16" x blah blah blah o-ring. :P

Btw....danco#10 will feel a bit snug but as long as you lube it well it will work great.

#18 Boss302

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Posted 14 June 2012 - 06:28 PM

Looks like switching out the o-rings does help. ;)

#19 nosaj

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Posted 14 June 2012 - 07:56 PM

What did you use to polish the bolt?  I might have the proper tool lying around....

Could you also post a pic of the bolt?

Edited by nosaj, 14 June 2012 - 07:57 PM.


#20 niko_gpsy

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Posted 15 June 2012 - 08:07 AM

I used a wooly dremel 200grit sanding bit to take the paint off then a 400grit one. Then finally used a polishing bit with "mothers metal polish" for the polished look.  I'll post a pic when I can.




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