[COBrien]

Check your sear and disconnector -- those are the only 2 parts it could be.

Without having any parts in front of me, I couldn't tell you for sure what might be happening. I'll have to strip mine down and fool with it a bit.

Or maybe someone who's experienced this can tell you for sure.

 

[COBrien]

Just stumbled across this diagram over at RFC, and thought it might help with diagnosis...

Sounds like your sear isn't catching the hammer on its return trip.

From what I can figure, one of two things is causing this. Either (1) your hammer/sear engagement is FUBAR, or (2) your disconnector isn't resetting the sear.

Have you checked your disconnector/sear spring?

EDIT: Can you "hold off" the second shot? By that I mean pull the trigger (bang), then hold it back (no bang), until you release (bang). Or was it doubling/following?

 

[COBrien]

Didja ever get it figured out?