smoky,
I have a particular Contender that has had a hammer extension on it for 16 years and has fired thousands, and thousands, and thousands, and thousands of rounds using .223, 30-30, 7-30, 44, and 445 reloads and misfires have NEVER been a problem...Period. There is actually a safety issue with the Contenders and letting the hammer down with a 'scope in place. That hammer can sure slip and cause an accidental discharge. Best to put the hammer safety into effect when doing the above. My cousins and uncles have the Encores with hammer extensions, and to my knowledge, they have not had problems with misfires. Ain't sure what Thompson/Center has to say about it though!!! Good-luck...BCB