Tried out my recently acquired carbine today. Both Remington #11 and CCI #10 fit. Both required two hammer strikes. All six would go click on the first try then fire on the second. Two cylinders were included with the gun and both did the same thing. As they would fire I’m assuming just a bad cap fit on the cones rather than a weak main spring. Any advise from owners/shooters appreciated on after market nipples, size, brand, supplier etc. I’ll need to fit both cylinders. As an aside the diminutive little gun held a very respectable group at 25 yards with an elbow rest on the shooting bench for a total of 36 shots. The piece wasn’t advertised as new, but is in a pristine unfired condition , Uberti, fit and finish very good and a very attractive piece of wood on the stock. Came with a nice Plano rifle case and the extra cylinder is in a leather belt pouch. Incidentally the upper tang on the stock is roll engraved with the year of manufacture, 2018 as well as the usual boxed date code on the barrel.