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Thinking of buying an LM4


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#1 kwaispro727

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Posted 17 November 2013 - 09:22 AM

While I know what I want to do externally with the gun, what internal upgrades would you guys recommend if any?

#2 General Pickle

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Posted 17 November 2013 - 10:38 AM

Maple Leaf and EVO II bucking/tensioner set, RA-Tech Tightbore barrel, HNBR o-ring set. These things have been discussed many times in the LM4 forums, so I won't even attempt to sum up all of the conversations about these items. Use the search function to find topics with those terms and you should be able to find lots of information.

#3 Chuck S

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Posted 17 November 2013 - 11:45 AM

Am I the only one who's posted groups with the LM4?  3" at 50 yards 30 yards..  0.32g Elite Force biodegradable BBs at 390fps and 2.2j.

No internal modifications.  Stock bucking and hopup.  High power bolt.

Posted Image
-- Chuck

Edited by Chuck S, 18 November 2013 - 03:42 AM.


#4 kwaispro727

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Posted 17 November 2013 - 12:01 PM

View PostChuck S, on 17 November 2013 - 11:45 AM, said:

Am I the only one who's posted groups with the LM4?  3" at 50 yards.  0.32g Elite Force biodegradable BBs at 390fps and 2.2j.

No internal modifications.  Stock bucking and hopup.  High power bolt.
-- Chuck

High power bolt?

#5 gcw360

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Posted 17 November 2013 - 12:32 PM

View PostChuck S, on 17 November 2013 - 11:45 AM, said:

Am I the only one who's posted groups with the LM4?  3" at 50 yards.  0.32g Elite Force biodegradable BBs at 390fps and 2.2j.

No internal modifications.  Stock bucking and hopup.  High power bolt.

Posted Image
-- Chuck
Those are SICK groupings at that distance.  If it were someone else I'd call BS but frankly I believe you. DON'T mod that gun!!!  That's a grouping I expect at closer to 75-100 ft.

#6 kwaispro727

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Posted 17 November 2013 - 05:37 PM

I'm confused... is the high power bolt the stock bolt...? You said you didn't do anything internally.  But how are you getting .32s to shoot at 390 without upgrades? :shocked:

#7 gcw360

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Posted 17 November 2013 - 05:48 PM

View Postkwaispro727, on 17 November 2013 - 05:37 PM, said:

I'm confused... is the high power bolt the stock bolt...? You said you didn't do anything internally.  But how are you getting .32s to shoot at 390 without upgrades? :shocked:
Chuck has the LE bolt which is a drop in BCG.  It's an upgrade but technically there are no mods needed.  It simply drops in.  I have it too and it is a SWEET upgrade.  I can post some results if you would like e.g. a comparison of the stock bolt with the Harbor Freight o-ring vs the LE bolt and no other changes.

#8 Chuck S

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Posted 18 November 2013 - 03:40 AM

Typo alert!  That group is at thirty (30) yards, not 50 yards!  :)  (My back yard ain't that big,)  Fired off a table, no rest.

I'm not sure what the differences are between the LE/Training bolt and the stock bolt but the muzzle velocity is much higher.

-- Chuck

#9 gcw360

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Posted 18 November 2013 - 06:36 AM

View PostChuck S, on 18 November 2013 - 03:40 AM, said:

Typo alert!  That group is at thirty (30) yards, not 50 yards!  :)  (My back yard ain't that big,)  Fired off a table, no rest.

I'm not sure what the differences are between the LE/Training bolt and the stock bolt but the muzzle velocity is much higher.

-- Chuck
OK, I feel better know!  That's still very good.

#10 kwaispro727

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Posted 18 November 2013 - 10:22 AM

So where can I find the LE bolt?  I did a quick google search and came up with nothing.

#11 General Pickle

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Posted 18 November 2013 - 11:58 AM

View Postkwaispro727, on 18 November 2013 - 10:22 AM, said:

So where can I find the LE bolt?  I did a quick google search and came up with nothing.
They're not available for retail sale, nor have we heard that they ever will be. I'd love to get my hands on one, but honestly I don't think any fields would allow it anyway if it shoots as hard as we think it does. Your best bet would be to get a new bolt and then modify it to get ultra high velocity, if that's what you're looking for.

#12 kwaispro727

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Posted 18 November 2013 - 04:44 PM

I wasn't originally looking for super high velocity, but based on the results Chuck has gotten I think I'll look into it now.

#13 Rockhound117

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Posted 20 November 2013 - 02:19 PM

You should be able to get ~500 fps with a 6.01 TBB, shaved jet nozzle, and a stretched jet nozzle spring. I was getting between 480 and 500 fps on my chrono after doing all of that with .2's. I'd say it's over kill for sure though, unless you're going for a DMR.

#14 netpoc

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Posted 20 November 2013 - 05:02 PM

View PostRockhound117, on 20 November 2013 - 02:19 PM, said:

You should be able to get ~500 fps with a 6.01 TBB, shaved jet nozzle, and a stretched jet nozzle spring. I was getting between 480 and 500 fps on my chrono after doing all of that with .2's. I'd say it's over kill for sure though, unless you're going for a DMR.

That's what I'm running on my field gun with .32's. It's not really a DMR, but it can reach out and touch you. It's an extremely effective brush cutter though. At one point I had it up to ~555 fps... A little too hot anyway you look at it.

#15 kwaispro727

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Posted 21 November 2013 - 04:34 PM

The RA tech barrel seems like a good idea to me.  But there are a bunch of different buckings.  The RA Tech one that comes with the barrel... Angel... Maple leaf... which one would you guys recommend?  Also, does anyone know of a forum post with a video or photos of shaving the nozzle?  I can't seem to find one.  

I want to shoot the gun a bit first before I go and swap the barrel and play with the valve of course.

#16 JonathanNCP

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Posted 26 November 2013 - 07:26 AM

I would not recommend going high fps, or at least order new parts, do it to them and keep the original so you can change your mind. When i was shooting just at 400 with .30's I could sneak it on the field but there was always the danger of confusing my MED and hurting someone. One guy here in NC got a bb shot through his bottom lip from a KA GBBR and we always have to be careful since are gun can be so powerful. Aside from that I also had problems with hop up (4 out of 10 rounds wound drop like theres no hop) and the mags wouldnt last long at all before I needed a gas refill. All of these problems disappeared once I went back to the original rocket valve, plus I had a better piece of mind shooting people with virtually no MED.

Edited by JonathanNCP, 04 December 2013 - 12:23 PM.


#17 Chuck S

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Posted 27 November 2013 - 04:06 AM

Keep in mind my use for the LM4, or any airsoft, does not normally require it to be shot at living targets.  Consequently I'm mainly concerned with range, accuracy and simulating the 5.56mm M4 Carbine which she does very well.  Folks engaging in airsoft games need to keep other-player safety paramount.   My limited experience with airsoft indicates that faster, heavier BBs tend to be more accurate if they hopup can handle them.

-- Chuck




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