JBM - Personal - HK USP Trigger Smoothing - 9

Smoothing the Disconnector, Catch and Sear and Reassembly

Smooth the parts as shown. I don't know how much this really helps the trigger pull, but I did it anyway. These parts contact things like the firing pin block, the top of the trigger bar, etc. I also polished the sides since they rub against each other.

Reinsert these into the frame and insert the sear axle. I find it easiest to with a small punch inserted from the left side of the frame and the pin inserted from the right side of the frame. Gently move the punch in a circular motion to line the parts of and push the pin in incrementally as the parts line up.

With the pin inserted, it should look like this:

Note that the pin has not been pushed all the way in since we have not put the detent plate in.