Hey guys, I just wanted to share this in case it was happening to anyone else.
I purchased a NS2 M93R from airsoftatlanta.com. It arrived right away even though I am in Japan at the moment so props to them. The Gun is awesome. Everything I expected from an NS2 KWA piece. However, I was having an issue with the slide locking back even when the magazine was full.
Also the harder I gripped the pistol the more often it happened. If I gripped it hard enough it would lock the slide back on every shot.
If I held the slide stop down while firing, the gun would fire in all modes without a hitch. But with me holding down the slide lock, it would not stay back on teh last shot.
Also If I held the gun loosely it would fire fine, even empty a full mag on full auto in most cases.
I contacted KWA since the gun was brand new. Naturally without any hesitation they told me to send it in to be repaired under warranty with no headaches. Just the kind of customer service I was expecting from KWA.
But still, me being me, of course I had to give it a go myself. Void the warranty? yes, but it's in my nature to ^7*K with this kind of stuff. It's part of the fun to tinker with these guns.
So after watching the slide lock on a high frame rate video camera it seemed apparent the rcoil energy was transferred to the slide lock when the gun was held tightly and would cause it to bounce up prematurely.
Now a stronger slide stop spring might solve this issue, but I am sure KWA made the spring rate what it is for a reason. I needed the slide lock to stay down just a hair more than it did.
Enough talk here is what you came for.
Disassemble the weapon to it's basic parts...
Rotate the slide stop 60 degrees or so and slide it out being careful not to damage your slide lock spring.
Then remove the left side grip panel...
The first thing to try is to increase the tension of the slide stop spring. The red lines are the original spring position. You can increase the tension by slightly bending the legs...
Take a small file and flatten/deburr the top of the slide lock. JUST A FEW STROKES WILL DO! The red arrow points to the shiny part of the slide stop that I filed...
Then take the grip panel and file the area where the slide lock sits to be just a hair deeper. You may also deburr/widen the gap between the grip panel and the frame to give the slide lock some breathing room.
Put it all together again. It should look no different than it did before.
You'll notice the slide stop is now just slightly recessed and out of the way...
The slide stop now functions fine WHEN IT IS TIME TO FUNCTION and out of the way when it's not.
Here is the M93R and it's associated M93R belt rig=). The other M93R is actually a KSC Plug Fire Cap gun. I purchased it on accident, it turned out to be pretty friggen cool.
Edited by GOLGO 13, 24 March 2010 - 06:42 PM.