KSC/KWA USP Compact Single Action not working.
 

Put a magazine in, rack the slide checking that the valve knocker lines up. Slide is now forward, hammer is cocked. Pull trigger, nothing. Pull again, hammer de-cocks.

It'll fire fine in double-action. I figure I may need to polish a few parts, but since I'm not entirely sure what sets the difference between the single and double action, I'm looking for some insight.


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Did you do anything to it or is it new?

Sounds like a problem with the slide not returning to battery completely. But no idea why it fires in double only or if that's only coincidence.

Isolate the issue. Does this happen with no magazine in?

I think I've found my issue. The sear on the right, gets pushed down by the slide when it's not at battery to disable the trigger. When I push it down without the slide on, it is hesitant to pop back up. Tried adding a lil more lube, but I think I'm going to pull the part and smooth the sides with some 1000 grit.


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