Oh I am not saying that there aren't folks that can make them run. There is a good bit of work that has to done to them to get them to run. Mine is in 45 Colt talk to a fellow shooter about the blow by told me there wasn't anything could be done. Another one told me either more powder or a heavy bullet. That sounded good tried the more powder deal got more blow by. Didn't try the heavy bullet. I have a 73 love it had it adjust smooth as glass, the price free.
Some day I plan to put a short stroke kit in it and the new 66 I have, the person that can do that for me live a few miles down the road from me. I don't have to send them off get them to worked on.
Everyone has what works for them and what they like,to me and in my hands they are slow. Since I am the shooter its what works for me. I am far from a world class shooter but one never knows, if it gonna take a Marlin slicked up to get me to the world class shooter then that is what I am going to shoot but for me now I shoot a 73 and 66.
So for me my answer for me makes perfect since.
amost 100 bucks for a triger wow that is costly.