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Slide won't lock back


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#1 dragonbum

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Posted 08 January 2011 - 06:54 PM

So I've had my MP9 for a few months now, I've taken it apart numerous times to clean it. I don't know if this is a gas problem becuase it is cold but the bolt wont lock back after emptying a mag. It locks when I pull the charging lever but not when I pull the trigger, even with an empty mag. I don't think it's a gas problem because I tried it indoors and it doesn't do it either. Help? I mean I can still use the gun, but it's nice to know when you're out of ammo.

#2 gcw360

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Posted 08 January 2011 - 07:18 PM

Do you have another mag you can try?

#3 dragonbum

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Posted 09 January 2011 - 01:13 AM

View Postgcw360, on 08 January 2011 - 07:18 PM, said:

Do you have another mag you can try?

Yes I tried 2 new mags I got. Same thing.

#4 HolyHandGrenade

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Posted 09 January 2011 - 12:54 PM

Did you mod the bolt catch to keep it from scouring your bolt?

#5 Spiggy

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Posted 11 January 2011 - 03:57 PM

I doubt the scarring will do anything of this nature.

If your magazine followers are damaged, they can break the bolt catch.  That is unless you're emptying an entire magazine in one trigger pull.  Your magazines will definitely be too cold to cycle and lock.

#6 dragonbum

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Posted 12 January 2011 - 11:13 AM

View PostSpiggy, on 11 January 2011 - 03:57 PM, said:

I doubt the scarring will do anything of this nature.

If your magazine followers are damaged, they can break the bolt catch.  That is unless you're emptying an entire magazine in one trigger pull.  Your magazines will definitely be too cold to cycle and lock.

I've sanded down the sharp edges already.

I've tried on semi with no bbs in. No good. The bolt catch works fine if I pull back on the charging handle. So the slide is most likely not reaching the locking point. I did find that one of my springs is stretched oddly. Do you guys think that could be the problem?

Attached File  spring.jpg   163.85K   25 downloads

#7 Spiggy

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Posted 12 January 2011 - 11:55 AM

it has a slight kink in it, but it doesn't look too bad.

If you fill up a magazine complete with gas, let it warm up, and only put in 3 bbs, will it lock?

#8 dragonbum

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Posted 12 January 2011 - 11:35 PM

View PostSpiggy, on 12 January 2011 - 11:55 AM, said:

it has a slight kink in it, but it doesn't look too bad.

If you fill up a magazine complete with gas, let it warm up, and only put in 3 bbs, will it lock?

So I ran the mags under hot water and loaded the 3 bb's. They all locked back! Thanks Spiggy! I guess my room gets pretty cold when I'm not around with the heat on. This gives me a good idea, since running warm water on the mags worked, do you think I could effectively use my MP9 in winter if I stick a bunch of hand warmers all over the part of the mag that protrudes from the gun? Haha, just a crazy idea.

Edited by dragonbum, 12 January 2011 - 11:40 PM.


#9 dobey

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Posted 13 January 2011 - 05:08 AM

They do work just fine to keep things warm, they help batteries as well.  When I am playing in the cold I always grip the lower part of the mag that is sticking out of the gun with my off hand to keep it warmer as well, works real nice.  I also have the spare mags inside my jacket to help keep them warm.

#10 dragonbum

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Posted 13 January 2011 - 06:01 PM

View Postdobey, on 13 January 2011 - 05:08 AM, said:

They do work just fine to keep things warm, they help batteries as well.  When I am playing in the cold I always grip the lower part of the mag that is sticking out of the gun with my off hand to keep it warmer as well, works real nice.  I also have the spare mags inside my jacket to help keep them warm.

Awesome, I'm definitely going to try this out this weekend!

#11 Spiggy

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Posted 13 January 2011 - 09:31 PM

View Postdragonbum, on 12 January 2011 - 11:35 PM, said:

So I ran the mags under hot water and loaded the 3 bb's. They all locked back! Thanks Spiggy! I guess my room gets pretty cold when I'm not around with the heat on. This gives me a good idea, since running warm water on the mags worked, do you think I could effectively use my MP9 in winter if I stick a bunch of hand warmers all over the part of the mag that protrudes from the gun? Haha, just a crazy idea.
not crazy at all, in the days of yore, I would keep my GBB mags under a cooking MRE box to keep them warm.  After all, the MRE heater instructions say "Place on Rock or Something"  :P one way to do it.

#12 HolyHandGrenade

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Posted 16 January 2011 - 05:56 PM

View PostSpiggy, on 11 January 2011 - 03:57 PM, said:

I doubt the scarring will do anything of this nature.

I was hinting at the fact that he might have ground it too much, not that it needed done.

But good to hear you got it working.

Edited by HolyHandGrenade, 16 January 2011 - 05:58 PM.


#13 dragonbum

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Posted 21 January 2011 - 08:58 AM

View PostSpiggy, on 13 January 2011 - 09:31 PM, said:

not crazy at all, in the days of yore, I would keep my GBB mags under a cooking MRE box to keep them warm.  After all, the MRE heater instructions say "Place on Rock or Something"  :P one way to do it.

Two birds with one stone haha!

#14 Italian13

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Posted 21 January 2011 - 09:41 AM

View Postdragonbum, on 21 January 2011 - 08:58 AM, said:

Two birds with one stone haha!

I have foot warmers that are sticky on one side. I stick them to GBB mags during play, then to my feet during break/endex.




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