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Mp7 Short mag rattling Sound


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#1 crouchingpanda

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Posted 09 April 2013 - 01:58 PM

Hi I am new to the forums and have a question so please excuse me if I break any rules. One of my 20 round mags are making a rattling sound if I shake it, its as if something got loose inside of it and rattling about. The sound sounds like it is a piece of metal that got loose inside. Is the mag still safe to use and can I somehow fix it? thanks.

#2 Chuck S

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Posted 09 April 2013 - 02:32 PM

There's a "gas expansion" tube in all KWA gas magazines.  It's probably loose. The tube is closed at the magazine floor plate level and open at the top.  You'll have to disassemble the magazine and screw the tube back into the floorplate.  Shows as part 226 or 206 depending on the 20 or 40 round magazine.

You fill the magazine with gas inverted and the tube prevents overfilling the mag with gas -- which is actually a liquid as it goes into the magazine.  Just like holding your finger over the top end of a soda straw and inserting it into your Coke, the liquid does not enter the straw/tube.  The empty space leaves room for the liquid to volatilize into a gas to power the gun.

-- Chuck

#3 gcw360

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Posted 09 April 2013 - 03:56 PM

Nice explanation

#4 crouchingpanda

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Posted 09 April 2013 - 07:00 PM

Thanks for the advice!

#5 kwaispro727

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Posted 10 April 2013 - 06:20 AM

Why do the short mags not perform as well?  Just because they are smaller?

#6 gcw360

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Posted 10 April 2013 - 05:28 PM

View Postkwaispro727, on 10 April 2013 - 06:20 AM, said:

Why do the short mags not perform as well?  Just because they are smaller?
Shorter/smaller mags tend to suffer more from cool down from gas expansion.

#7 Outlaw1995

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Posted 12 April 2013 - 07:14 PM

View Postgcw360, on 09 April 2013 - 03:56 PM, said:

Nice explanation
Way to go Chuck! :clap:

#8 General Pickle

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Posted 13 April 2013 - 09:49 PM

View Postgcw360, on 10 April 2013 - 05:28 PM, said:

Shorter/smaller mags tend to suffer more from cool down from gas expansion.
I bought 2 of the short mags a while ago thinking they'd be cool for more scenario type situations where a concealed MP7 would be handy; those short mags were nothing but trouble. From day one they leaked, as opposed to my 6 long mags of which 0 have leaked EVER, as well as the fact they (the 20 round mags) simply cannot feed full auto, it just won't happen due to cool down. Why do the 20 round mags suck so much? I have no idea. I can't imagine that the smaller size would effect the performance THAT much...

Anyway, to fix that mag make sure it's depressurized before you begin, then use pin punches to remove the bottom assembly. Once it's open you should be able to see the expansion tube in question; take that tube and push it back into the floor plate firmly. The hardest part of this is putting the pins back in; you'll probably need to push your weight on the mag on a table while sliding the pins in from the side. DON'T FORCE IT, it should slide through easily. Pounding it with force may damage the mag and make it useless.

Hope that helps somebody!




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