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LM4 Barrel?


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#1 kwaispro727

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Posted 16 January 2013 - 12:55 PM

Is either of the LM4 barrels in the Pro Shop compatible with the MP7?

#2 Outlaw1995

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Posted 16 January 2013 - 01:33 PM

I heard they were, except you had to modify the hop up and find a way to remove some of the thickness of the barrel. If you can profile the barrel with a mill to make the circumference smaller, then yes, it is compatible... with heavy modifications... But if you don't have access to re-profiling the barrel, then no. It is not compatible.

What BENboBEN said.

Edited by Outlaw1995, 16 January 2013 - 01:38 PM.


#3 BENboBEN

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Posted 16 January 2013 - 01:37 PM

No, but barrels made for the KSC M4 (with ball bearing hop-up) will work, kinda. I installed a Guarder 370mm 6.02mm barrel and it fits. But it needs heavy modification. The big problem is that the M4 barrels are a lot wider, about .5mm (which is huge when trying to fit), and you have to shave most of the outside of the barrel down with a lathe. Still then, once it fits the hop up side isnt cut the same so the bucking is kind of smushed against the outer barrel. It works so far, just doesnt fit like its supposed to.

Basically, neither of the LM4 barrels can work, but KSC M4 barrels work with heavy mods.

#4 kwaispro727

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Posted 16 January 2013 - 03:24 PM

View PostBENboBEN, on 16 January 2013 - 01:37 PM, said:

No, but barrels made for the KSC M4 (with ball bearing hop-up) will work, kinda. I installed a Guarder 370mm 6.02mm barrel and it fits. But it needs heavy modification. The big problem is that the M4 barrels are a lot wider, about .5mm (which is huge when trying to fit), and you have to shave most of the outside of the barrel down with a lathe. Still then, once it fits the hop up side isnt cut the same so the bucking is kind of smushed against the outer barrel. It works so far, just doesnt fit like its supposed to.

Basically, neither of the LM4 barrels can work, but KSC M4 barrels work with heavy mods.
Could you perhaps PM me or even post here more in depth about how to modify the guarder barrel?  Have you lost any compression or anything like that?  How long has it been working?

#5 BENboBEN

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Posted 16 January 2013 - 03:52 PM

No need for a PM, this is what forums are for, a think tank. Anyway, the M4 barrels basically have two different thicknesses. It is thinner at the hop up end, and thickens out. The thick part needs to be shaved down to the same outer diameter of the skinnier part. That is it for mods. You can probably try to mod the hop up end a little to make it fit better, i didnt. It works fine, so i dont care.

Now, I havent tested and observed how its doin performance wise and just how its holding up for a couple reasons.
1. I'm in college. And with a roommate and all this anti-gun crap floating around and the fact that if I mention the word gun, everybody proceeds to think Im going to be behind the next mass shooting, its just better to leave anything gun related at home.
2. Its freaking cold. Due to Michigan's amazing weather, its freaking cold and constantly snowing. It hard, actually impossible, to see how bbs are hopping up. I also dont have a chrono so I cant give you performances there.
I don't play anymore because there is no airsoft community in MI, and the few people i did play with quit or moved away. I collect and tinker, so in game practicality isnt my thing. I just try to see how many crazy things I can create.


#6 aaps59

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Posted 16 January 2013 - 03:54 PM

View PostBENboBEN, on 16 January 2013 - 03:52 PM, said:


1. I'm in college. And with a roommate and all this anti-gun crap floating around and the fact that if I mention the word gun, everybody proceeds to think Im going to be behind the next mass shooting, its just better to leave anything gun related at home.
Story of my life

#7 kwaispro727

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Posted 16 January 2013 - 04:10 PM

Wow, so it's just the outer diameter?  Dude I wish i had known this sooner lol.  Sweet!  I've come to the conclusion that the angry gun thing can't work.  Why?  Simple.  The pressure needed to maintain compression is too much.  Oh well.  I'm still ahead given the price of a trademarked supressor :)

#8 BENboBEN

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Posted 16 January 2013 - 04:34 PM

Yah, its not an easy task to shave it down though without heavy machinery. Another thing is, might not be a problem for you, my barrel extension wobbled around to the point that it would obsteuct the bb leaving the barrel. I used an broken LM4 hop up adjustment ring thing and some electrical tape to center it and its amazing now.

#9 Outlaw1995

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Posted 16 January 2013 - 04:37 PM

View Postaaps59, on 16 January 2013 - 03:54 PM, said:

Story of my life
Story of your life? Every time the issue comes up, you hide in a corner. I'm left defending myself, until I get cursed out by our absolutely lovely classmates. :P

#10 kwaispro727

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Posted 16 January 2013 - 04:40 PM

Ah the joy of still being in highschool :P

I know there are some heavier files in my garage somewhere, I'll get it done :)

Edited by kwaispro727, 16 January 2013 - 05:12 PM.


#11 BENboBEN

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Posted 16 January 2013 - 06:18 PM

View PostOutlaw1995, on 16 January 2013 - 04:37 PM, said:


Story of your life? Every time the issue comes up, you hide in a corner. I'm left defending myself, until I get cursed out by our absolutely lovely classmates. :P
Oh, I'll defend it all damn day long. I hate people telling me I'm crazy for liking guns. I won't take it. This Newton incident is just making things worth. Because I target shoot with AR15, I apparently want to kill children. I am in no way condoning gun violence, especially this recent horror show, but its making people's emotions run nuts. Banning ARs won't help. Out of 12,664 gun murders last year, 323 were by rifles, not just ARs, but all kinds of rifles. Pistols are the hardest to obtain legally, but are used in almost all murders.

Ok, rant over, back to KWA!

#12 BENboBEN

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Posted 16 January 2013 - 06:21 PM

View Postkwaispro727, on 16 January 2013 - 04:40 PM, said:

Ah the joy of still being in highschool :P

I know there are some heavier files in my garage somewhere, I'll get it done :)
No files, need a lathe. Files WILL bend and smush the barrel. Plus take to long.

#13 kwaispro727

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Posted 16 January 2013 - 06:29 PM

What do you mean bend and smush... and aren't lathes pretty expensive?

#14 BENboBEN

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Posted 16 January 2013 - 06:50 PM

I mean that with a file it with take you FOREVER to do because just a fraction too tick and it will not fit. When you running a file back and forth you are building a lot of heat. The brass gets more bendy. Even if you know you cant you will end up putting a lot of pressure on the barrel. A little bend or flat spot is enough to ruin it. And yes, lathes are VERY expensive. A friend of a friend grinded mine down for me. A lathe is the best way to do it.

#15 kwaispro727

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Posted 17 January 2013 - 05:24 AM

Well I don't have one... so... any idea where I could get it done?

#16 BENboBEN

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Posted 17 January 2013 - 08:19 AM

Thats the thing, if you dont have one or know somebody who does, its not really worth doing. You can try with the file but it will take to long and frustrate the crap out of you.

#17 BENboBEN

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Posted 17 January 2013 - 11:51 AM

View Postkwaispro727, on 17 January 2013 - 05:24 AM, said:

Well I don't have one... so... any idea where I could get it done?
Also, I might be willing to do it for people. But not now. Like I said, in college and away from home. Maybe this summer I'll do it. I also want to make damn sure that it doesnt affect the gun negatively in away way before i consider doing it for people.
I will most likely make a new post or PM you if I ever start grinding them down.

#18 kwaispro727

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Posted 17 January 2013 - 12:54 PM

I believe there are a few places around here that MAY be able to do it.  Considering how relatively cheap the barrel already is, I think it's worth it.

Have you even shot the gun at all yet with it installed?

Edited by kwaispro727, 17 January 2013 - 12:54 PM.


#19 BENboBEN

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Posted 17 January 2013 - 02:13 PM

I have, it works. No jams, no problems. Hop up seems to work right. No FPS readings, or accuracy reports.

Oh, one more thing. I cut a tiny bit of the bucking down on the muzzle end, so it wasnt so smushed to the barrel.

#20 kwaispro727

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Posted 17 January 2013 - 02:51 PM

Ah.  Well I imagine the accuracy didn't get any worse.




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