What's going wrong here?

Gatehouse

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Pemberton BC
Sig 226 clone NP762. I bought 2. One works great. The other one will operate normally in double action but in single action the trigger has gotten progressively harder to squeeze and now it simply won't drop the hammer.

Fully assembled it will operate normally in double action. With mag removed and empty chamber I can dry fire in double action all day. Try to operate in single action and the trigger will fully depress without dropping the hammer.

Remove the slide and operation is normal. Can fire in double or single action.

I tried swapping slides between the two and the same problem occurs regardless of what slide is installed.

I took a bit of it apart to try to see if anything obvious was happening. I exposed the trigger bar and spring. When I #### the hammer and pull the trigger nothing happens, but if I continue to apply trigger pressure and stick a screwdriver in there and give the trigger bar a little nudge forward, the hammer drops.

Here is a short out of focus video demonstrating the problem, hope it's viewable.




Is the trigger bar spring just feeble?
 
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I'm starting to think the trigger bar spring is just feeble. When I remove the grips and check the function of both of these pistols there is night and day difference between the operation of the springs and trigger bar. The good one seems robust and positive, the bad one is wobbly and inconsistent.
 
Lone Ranger, that looks exactly like what I need. Unfortunately the handguns I got from Tenda didn't include extra springs. Or I put them aside and forgot about it...I guess I'll start looking for some....Thanks
 
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