Brand new Kolar pins and springs. Spring cut by a few coils. Pin passageways cleaned.
50% of the time bottom barrel fails to fire with a light strike to the primer. Closing the gun again and keeping same wheel in bottom barrel successfully fires.
Send your trigger group back to Kolar and have them install new hammer springs.
My gun was annualed in December 2019 and has been shot about 10,000 rounds since. Recently, I have been getting an occassional fail-to-fire in the bottom barrel. I called Kolar and talked to one of the technicians. He told me that in October of last year, they made a change to the tip profile of the firing pins as well as increased the installed load of the hammer springs by about 20%. The real answer to your problem, most likely, is the increased driving force of the hammer springs.
Firing pin springs, not main springs. Firing pin spring clipping is something Kolar frequently does to reduce inertia against the pin moving forward toward the shell.
With FACTORY NEW ammo? Or just reloads? It is possible as " headhunter1" has stated "primers are set too deep."
Ok, you did your best to solve the problem yourself, If nothing else let Kolar fix it, SEND IT BACK TO KOLAR!
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