Trigger & Bolt Spring, New Reproduction ITEM #181990A

 As possibly some help to fellow tinkerers, This Bolt spring fit my 2022, 1858 Uberti and 2023,1862 Pietta Spiller & Burr. The tangs are longer than other Cap & Ball springs. It is also twice as thick( Much stronger in strength). Usual tuning necessary.  I did notice ,in the S&B that the tension seemed to hang up on the half cock notch when working in slow mode. So further tuning may be required.