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Mags Dropping out of receiver?


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#1 Danneichh

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Posted 14 April 2013 - 07:12 PM

Hey all, having some issues with my lm4's mag catch. It seems that while firing, occasionally my mag will simply drop out of the receiver. I've gotten lucky in that I've either been prone or firing on top of a stand, but this is clearly an issue. This happens with both stanags and pmags, so I beleive its my rifle, and not the mags. I think my mag catch isn't extending far eniugh into the receiver. Has anyone else experienced this? And if so, any solutions?


#2 ky2970

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Posted 14 April 2013 - 07:40 PM

What I've seen happen is people overfilling their mags with BBs which prevents you from fully inserting the mag into the rifle with the bolt closed. The BBs hit the loading nozzle. Other than that, I haven't heard of any issues.

#3 Danneichh

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Posted 14 April 2013 - 07:49 PM

That isn't it. I short load my mags to 30. And I can fire some rounds out, and then have the mag drop. On your LM4, does the mag catch sit flush with the receiver when the mag is out? Mine sits about a milimeter out.

#4 BeachEMT

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Posted 14 April 2013 - 07:53 PM

Is the screw loose on the mag catch button? Maybe try tightening it.

#5 Danneichh

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Posted 14 April 2013 - 07:57 PM

Its as tight as it can be. :( My previous question still stands, does your mag catch sit flush with the receiver, or does it stick out a little bit?

#6 BeachEMT

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Posted 14 April 2013 - 08:08 PM

I'm not home, but if I remember correctly it's actually recessed slightly (maybe a half mill).

#7 Danneichh

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Posted 14 April 2013 - 08:11 PM

I should also add that my mag release button only needs to be pushed in a very small bit to release the mag. Recessed you say?!? Then mine is way out. As I said before, mine actually sticks out roughly a millimeter.

Edited by Danneichh, 14 April 2013 - 08:12 PM.


#8 -wigs-

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Posted 14 April 2013 - 08:24 PM

The arm of the mag catch on mine isn't flush with the reciever or recessed, it's out about a mm same with every other lm4 I've seen.

#9 Danneichh

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Posted 14 April 2013 - 08:36 PM

This isn't good then. Sounds like mine is where it should be. Any ideas?

#10 -wigs-

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Posted 14 April 2013 - 08:40 PM

Is the nub on the catch itself rounded out?


#11 BeachEMT

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Posted 14 April 2013 - 08:40 PM

Does the "tooth" look worn down?

#12 Danneichh

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Posted 14 April 2013 - 08:45 PM

It does not. The paint is scuffed, but the metal is solid and 'sharp'. Not worn down at all.

#13 BeachEMT

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Posted 14 April 2013 - 08:47 PM

Maybe try inserting a mag in the lower with the upper removed, and see how much lateral play there is.

#14 Danneichh

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Posted 14 April 2013 - 09:03 PM

There is almost no play in any direction. I'm completely stumped by this. A friend suggested I file the catch down around the rod that goes through the receiver, but that seems a bit extreme, especially if my mag catch is sitting correctly as it is.

#15 The Nutty Professor

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Posted 14 April 2013 - 09:55 PM

For some reason your mags are not seating properly. Meaning they're not up far enough for the catch to hold them in place. I had this probably on a RS Glock once. Like someone said take the upper off and see what it looks like when you insert  mag> I bet you're see something you didn't expect.

#16 Chuck S

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Posted 15 April 2013 - 03:09 AM

My magazine catch sits slightly higher than the receiver regardless of a magazine being in the gun.  Sits the same way either way.  This tells me it's as deep in the receiver it will go.  Is yours deeper in the receiver without a magazine?  I'd expect that if it's not latching correctly.

Expanding on Nutty's idea insert a loaded magazine in the gun with the receivers open like an old shotgun  tug on it to be sure it's in there solidly, close the receivers, and see if the problem still exists.  Inserting without the upper latched will eliminate any bolt carrier questions.  If it works this way there's some interference with the upper receiver.

Since the problem is with both MagPul and STANAG magazines I still suspect the magazine catch or an imperfection in the lower receiver in the mag catch area.

-- Chuck

#17 Danneichh

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Posted 15 April 2013 - 07:37 AM

Thanks, I'll give that a try. This may get expensive, as I don't beleive I have warranty with KWA. I live in Canada, so I'm unsure. On an unusual side note, this only seems to occur during games. Attempts to recreate the problem by firing away at home, shaking the gun, etc. Have been unable to make the mag fall out. I made sure the mag release button was clear all day, so I ruled that
out. I should also note that this does not happen every time, I went the first three hours of a game yesterday with no problems, and then it started. I could also have one mag fall out, insert a fresh one, and fire it until its empty.

#18 Icurblud

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Posted 15 April 2013 - 08:26 AM

This same thing happen to me on Saturday while airsofting.  My mag fell out twice.  Later that night i pulled my upper off and iserted the pmag in the lower.  I have, what i would say, alot of wiggle room.  I have up and down and side to side movement. I shot a 30 sec video to show but dont know if i can post a video here.

http://s725.photobuc...c00566.mp4.html

Danneichh does your bolt lock back when you fire the last round.  One of my mags does not allow the bolt to lock back with after i fire the last round.  If i put my hand under my mag and push up it locks back on the next shot.  I thought it was because of all the slop the bolt is not locking back.  I need to look into it in more detail.  Let me know what you come up with.

#19 Specter777

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Posted 15 April 2013 - 04:16 PM

I ran into a similar problem this weekend. The first magazine I inserted fell out after I shot my first round. I also had the bolt lock back when the magazine still had rounds 4-5 times during the game. I bought my lm4  secondhand, and I talked with the previous owner about this problem. It seems that he may have crushed the magwell ever so slightly in a vice to cause this problem. Does anyone know a solution to this other than buying a new lower from KWA (If they even sell empty lowers)?

#20 Danneichh

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Posted 16 April 2013 - 01:37 PM

I don't appear to have much wiggle room, everything seems snug. I did also have my bolt lock back a few tines mid-mag. However, I haven't had any issues with my bolt not locking back. Do you guys know what airsoft/RS mag catches drop right into the LM4? if I can't get it sorted, I'll end up replacing the mag catch altogether.




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