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Gas Gun Questions


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#1 kwaispro727

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Posted 05 January 2013 - 01:12 PM

So, my MP7 is performing like a champ.  It's 35 degrees out and I got off 3 - 3 1/2 mags off of one gas charge, while reloading the BBs OUTSIDE!  But I noticed a few things that seemed a little funny with both it and my M9.

---MP7---
1.  When I shot relatively quickly in semi-auto, it would double-fire sometimes.  I tried taping it with my iphone so I could slow down the footage on my mac to see exactly what was up but I couldn't catch it again.  Is it just double feeding?  Why?

2.  When I fire longer bursts in full auto, sometimes it would just stop and start dry firing.  When I released the trigger and started to shoot again, 3 or 4 BBs came out.  Then it was back to normal.  I have no idea what's up with that...

Could the cause of both of these problems simply be that the gun is not cycling correctly in the cold?  I'm sure the gun is well lubricated.  I can see it seeping out from the top of the bolt slightly when I shoot.

---M9---
1. This I simply don't understand.  At one point, it simply dry fired without shooting at all, on and off throughout one mag.  Then it was fine.  Sort of.

2. Later when I shot more rapidly towards the end of the magazine the gun cycled kind of funny.  Just dry firing on and off and the hammer was only cocked 1/4 of the way back after running out of gas.  I think I was just shooting too fast, is there anything else that could do that?

3. I feel like there is too much wear and tear here considering I've only been shooting it a little bit on weekends since Christmas.  It looks a little worse in person.  Thoughts?
Posted Image
Posted Image

One other thing, why is my MP7 so much more gas efficient than my M9?  Or do I just have super-MP7 magazines... :P  One other thing.  Are there any tricks for putting the slide back on my M9?  I just have a bit of trouble haha.

Thanks I know it's a lot of questions LOL.

Edited by kwaispro727, 05 January 2013 - 01:15 PM.


#2 Chuck S

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Posted 05 January 2013 - 01:59 PM

You M9 magazine feed lips look beat up (or very dirty).  A lot of dry firing?

Regarding your MP7A1 being "well lubricated."  It should not be wet (seeping).  Guns -- any guns -- in cold weather need little or no lube because the lube slows the parts.  Try wiping the parts but leave them shiny (not dry) with silicone.

Not even that warm here today but I usually just step outdoors hit a few targets and go back inside to refill the magazines.

Magazine capacity is so low I rarely shoot more than a 3 round burst unless I'm walking BBs thru the snow.  Gas guns slow down with they get cold from shooting them even in temperate weather.  They get cold quickly shooting Auto.

-- Chuck

#3 kwaispro727

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Posted 05 January 2013 - 02:25 PM

I haven't been dry firing much so... I'm not really understanding why it's all beat up.  But your saying all the cycling, and weird feeding issues are do just to the cold?

Edited by kwaispro727, 05 January 2013 - 02:31 PM.


#4 gcw360

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Posted 05 January 2013 - 04:21 PM

View Postkwaispro727, on 05 January 2013 - 02:25 PM, said:

I haven't been dry firing much so... I'm not really understanding why it's all beat up.  But your saying all the cycling, and weird feeding issues are do just to the cold?
I'm at a bit of a loss...yes, it happens.  Regarding the feed ramp....to me it looks like BB residue.  Try taking a Q-Tip and see if you can clean it up a bit.  Regarding the firing issues, can you try firing indoors with a warm mag to see if you have the same issues?  If you don't then I'm guessing it's the cold....I don't even fire most of my GBBs till Spring!  Which will be very difficult when I finally get my Vector...

#5 kwaispro727

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Posted 05 January 2013 - 05:16 PM

I wasn't going to originally, but my patience ran out and I figured I would until the warranty expired ;)

#6 Chuck S

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Posted 06 January 2013 - 08:00 AM

See if the magazine and feed ramps clean up.  I was photographing my M9-PTP for the grip screw question so shot this on my mostly clean mag and chamber too.

Posted Image

No issues shooting my MP7A1 outdoors earlier today but she was indoor temperature.  I'll leave her outdoors and try again later to see if I can duplicate your problems.

-- Chuck




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