I successfully installed a Titan hammer in one of my stock 2 and a extreme delta hammer in the other, the extreme delta has a nicer single action in my opinion to be honest i almost prefer the stock two piece sear and stock hammer to the one piece sear and extreme parts, i have not broke it in yet so i will report back later. i also only fit one with the proper safety function and may leave the other where the safety does not engage as i never use it and i like the fact that i can never engage it when i do not intend to. more to come after some range time.