If I recall correctly the Uberti has a Neidner style firing pin.  Check to see how far the firing pin protrudes when hammer is fully down.  It should be in the range of 0.050" - 0.055".  Make sure there are no burrs in the firing pin hole and the the pin moves freely.  Also, the firing pin return spring could be too long or stiff.  Good luck.

How deep are your primers seated?

I have the same problem but in a bought new 38-55. It keep getting worse until yesterday when it stopped firing all together, hammer would stop in the half cocked position. I went ahead and ordered a double set trigger unit from Taylor & Company, was going to do that anyway, and decided to tear the Uberti down to get ready for when it gets here.

I think I found out what the my problem is...soft hammer!

The half cock teeth are getting hammered by the sear slowing or stopping the hammer.

bpcnut,

The hammer is cut for a fly but doesn't have one, it's a single trigger. It looks like Uberti cut all their hammers the same for single and double triggers.

What's happening is the hammer doesn't clear the sear as it falls. Even the full cock notch on the hammer has what looks like some wearing on it. That might explain why sometimes the hammer wouldn't engage at full cock.

I have not done anything to the sear engagement surfaces, it's all factory original.

Cheatin_charlie/Brutis,

I read both of your posts with great interest.  I think the problem in both of your situations is that the hammer is hitting the half cock notch as it falls taking much of the inertia out of the hammer strike on the firing pin.  I initially thought the likely problem was no hammer fly.  Since Charlie has installed a fly and still is having problems the fly may not be the issue.

I also thought about too strong a sear spring, but in a single trigger action when one pulls the trigger it should hold the sear out of engagement while the hammer drops.  So even if the sear spring is to strong that shouldn't matter. I'm beginning to think that the knockoff isn't raising the sear high enough to allow the sear to clear the half cock notch.  Even if you hold the trigger back and drop the hammer with your thumb if the knockoff isn't raising the sear sufficiently it could still hit the half cock notch.

Parting thoughts.  I have Uberti with doubleset triggers.  It has a fly that leaves the hammer in the halfcock position when the lever is cycled.  When the hammer is pulled back to full cock and fired with the front trigger (not set) it works just fine.  I'm beginning to wonder if all Uberti models included the halfcock fly as a safety feature.  If that's the case, and someone removed the fly, that could result in the sear hitting the halfcock notch if the knockoff wasn't sufficiently lifted by the fly.  If a fly was present this likely wouldn't be noticed until the fly was removed.

No problem.  Then it is not just me that is having problems.  I forgot to mention that mine will set off Federal large pistol primers but not rifle.  Even though it will set off the pistol primers it is still a mild hit.  Charlie

cheatin_charlie wrote on Oct 31^st, 2025 at 8:55am:


Charlie, I haven't looked at a Pedersoli that carefully. Are they a coil spring or a lever spring action? It does sound like you may have a weak hammerfall. How hard is the hammer to cock? Can you compare it to an original and see if there's a big difference? Bob

Brutis, Charlie,
Here's a picture of an original highwall half-cock notch.  Maybe it will help you when you reshape yours.

Old-Win wrote on Oct 31^st, 2025 at 12:59pm:

That looks like the half cock notch on the hammer I got with the Taylor&Company double trigger kit.

I had to fit the triggerguard to my frame while the lever and stock fit fine.

Now it fires all types of primers even the ones that had the lite strike on them.