The gun is a P226R 9mm with the DAK trigger. After firing the gun, the trigger will return just to before the first reset and then get stuck. With a light push from behind the trigger, it will fully reset. It only does this when there is a mag in the gun. It's also easy to reproduce the problem with an empty mag in the gun, especially when racking the slide while holding down the slide lock lever. As soon as the down pressure on the slide lock lever is released, the trigger fully resets on its own.
The gun has been completely stripped, cleaned and greased. All the springs are in good shape. It does this with both factory mags and MecGar AFC mags.
Any clue as to what is going on?
I'm not a Sig armorer, but I own two DAKs. I would check the trigger bar spring under the right grip panel. Make sure it's installed correctly and not binding on anything. Also look closely at how the trigger bar moves in relation to the sear, hammer, and safety lever. Make sure nothing is binding there either.
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Thanks 229R. Everything on the right side of the gun is good to go as far as I can see. It's really weird that holding down the slide lock lever prevents the trigger from resetting. My P226R DAK in 40 is mot like that. As soon as the down pressure on the slide lock lever is released, the trigger resets. The gun also consistently refuses to reset when live firing.
Stock grips? I had trigger reset issues putting on non-DAK grips on my P226 DAK.
The DAK components need more room and regular grip panels don't have it. So the gun can fire when you pull the trigger, but it doesn't return properly to reset, as it binds on the inside of the grip panel.
The test would be to remove the grip panel and see if it miraculously starts resetting properly.
The right grip panel is a factory P226 panel but it's from a DA/SA gun. I checked my other DAK gun right grip panel and it is modified. Looks like the factory ground some clearance on the DAK right grip panels. At some point, this problem gun ended up with a set of DA/SA grips. Gun works perfect with the clearanced grip panel.
For what it's worth, I had the exact same problem with mine. It turned out to be a bent trigger bar spring. I couldn't even see where it was bent but someone here suggested replacing it. I replaced it and no problem. Mine has DA/SA grips on it as well.
Glad to help. Love my DAKs - hope you do, too!
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