Stock 3 random hammers follower/extra shots

[Tonyscomputery]

I converted a single action only stock 3 back to production legal. Titan hammer, bolo, extreme sear, reduced strength sear spring, 14lbs patriot hammer spring. I took it out to test fire and it would random pop off 3 rounds. In my experience(semi limited) hammer follow normally doesn't pop off primers. So I was trying to trouble shoot. If I dry fired held the trigger and rack the slide and locked it back. Then released trigger and dropped the release. The hammer would randomly drop completely and occasionally to half cock notch. I took the firing pin block out. And the problem went away. Took it back to the range and put 150rds just fine. Apparently the block hitting the sear when the slide slams home is enough to drop the hammer.

 

Do I need to shave the arm?

Shave/smooth the block?

Stronger sear spring?

Edited May 31, 2017 by Tonyscomputery

[johnbu]

I'm thinking  the sear is rounded and/or the hammer hooks aren't sharp. (My "impression" is those are not new parts and potentially were polished through the surface hard layer)

 

 

But... not an issue I've seen or read about even. So, the above is just a wild swing at it.