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KMP9 Bolt catch problem!


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#1 dobey

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Posted 26 October 2010 - 12:25 PM

After taking my KMP9 down for some cleaning I was seeing allot of aluminum dust all over the place around the bb ramp area.  A little poking around and I have found the problem.  

The bolt catch is steel and appears to be a stamped part which leaves very sharp edges.  The corner in the following picture is cutting into the side of the bolt as it moves forward after a shot.  Easy enough to fix by rounding the corner very slightly with a file or some sandpaper, but left untreated this would really eat into the bolt.  This is after two days of skirmishing:

Posted Image

As you can see in the next picture the bolt has some pretty deep scratches in it already, glad I caught this fast.

Posted Image

#2 dobey

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Posted 26 October 2010 - 02:45 PM

Rounded both corners down slightly and now it is good to go, KMP9 owners will want to look out for this problem, it could easily cause the entire bolt to need replacing.

Posted Image

#3 Gun487

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Posted 26 October 2010 - 05:36 PM

Nice find Dobey! I'll be sure to check mine out.

#4 dobey

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Posted 15 November 2010 - 06:20 AM

I just had another KWA MP9R come into the shop, I checked the bolt catch and sure enough it was very sharp, and the bolt was just starting to show signs of the cutting action, there was also metal dust all around the bolt catch tip.

Here is the Bolt with only a few mags through it:

Posted Image

I highly recommend MP9 owners to smooth the corners out as soon as you get the gun.

#5 HOLLOWPOINT

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Posted 15 November 2010 - 09:17 AM

View Postdobey, on 15 November 2010 - 06:20 AM, said:

I just had another KWA MP9R come into the shop, I checked the bolt catch and sure enough it was very sharp, and the bolt was just starting to show signs of the cutting action, there was also metal dust all around the bolt catch tip.

Here is the Bolt with only a few mags through it:

Posted Image

I highly recommend MP9 owners to smooth the corners out as soon as you get the gun.


I will be doing this asap. I will also post some pictures .

#6 Starkweather

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Posted 23 November 2010 - 08:38 PM

View PostHOLLOWPOINT, on 15 November 2010 - 09:17 AM, said:

I will be doing this asap. I will also post some pictures .


Yowza. Just ordered mine minutes ago. I'll do this before firing. Nice find Dobes. Can't wait to shoot you with this...

#7 HolyHandGrenade

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Posted 24 November 2010 - 04:43 PM

Mine was also the same way, sanded and fixed now.

#8 lolomomo5

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Posted 28 November 2010 - 06:58 PM

Dremil or just sand paper.

#9 Zed8

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Posted 10 December 2010 - 05:54 PM

Thank you for that tip. Just got my MP9 yesterday, and fired a mag through it before I found this post.

It is now fixed (very little wear on the bolt so far) and I'm hoping that my KMP9 will be as reliable as my M19 has been.

I just used a small file and it took 5 minutes.

I would REALLY like to hear some KWA staff comment on this issue.

Edited by Zed8, 13 December 2010 - 01:03 PM.


#10 lil_redd_again

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Posted 31 December 2010 - 04:33 PM

Nice catch guys. I rounded my corners off as well. I havnt run into the odd firing problems yet but my bolt was wearing

#11 airsofteen

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Posted 31 December 2010 - 04:53 PM

well i just got my back from warranty and they smoothed mine out and polished it so im happy

#12 apacifico3

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Posted 20 March 2011 - 04:10 PM

Thanks for bringing this issue up Dobey.

#13 Pcon426

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Posted 30 December 2011 - 10:12 AM

I just received my KMP9R in black today and it did not have the sharp bolt catch, looks like KWA may have fixed the problem. Mine was nice and rounded.

#14 Tork

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Posted 02 March 2012 - 06:15 PM

Good catch man. Thanks for letting everyone know!
I'd also like to hear about what kwa says...




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