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Originally Posted by 604_ep3
Any more suggestions? I will try swapping the springs out of the blowback chamber tonight. It doesn't appear to be a mag problem. I tried my own two G19 mags and my buddies G17 and 23F mag with the same result. I keep my gun pretty well maintained and lubed, so lubrication shouldn't be an issue.
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Then do a simple test on the blowback chamber; pull the nozzle forward and release it. If it can slide back itself effortlessly, then it's working properly (don't push it back yourself, the springs should this all by themselves). If it binds/sticks, then it needs lube. Do this a few times to actually simulate regular use when firing.
Also, try lubing part#209 on the magazine. This part mates with the blowback chamber for gas flow. Lubing this part reduces friction between the chamber and the rubber when the magazine is in.
http://www.wgcshop.com/gun-folder/ksc-g17-install.htm