I am in the process of organizing a RO class. When I started the process I thought the class would fill up in a heart beat. My club is active and one of 2 in my area. I thought when the club emails went out my email would explode and it would be filled in minutes. unfortunately that wasn't the case. This sport is popular but its just not to the point that these classes are in high demand. If you see something close jump on it and tell your buddies.
I run mine for 4 hours or so. Once in a while I add some polish. Don't really think the polish does a whole lot tho. As far as the media goes, I change it when it gets real dark and doesn't seem to be getting the brass as clean as I like. I know thats a little vague but that one you'll probably have to get a feel for yourself. It does last quite a while tho.
I have a vibra prime and a RF100. So far I have about a half hour messing with the vibra prime and 3 hours with the rf100. So far they both are equally effective the only difference is the rf100 doesn't require me to hold a trigger to make it go. I'm getting close to selling my rf100 and going back to the tried and true pick up tubes. To all the rf100 people i have tried all the tricks here there and everywhere. It just doesn't want to run for me.
I would say as long as you do your research you will be ok with the M4. The M2 may be the Ferrari of 3 gun but you have a very nice shotgun. I just bought one too and was thinking the same thing. The only problem with it being gas driven is that it may or may not run light target loads. It is a born and bread combat shotgun and wasn't designed to run low brass bird shot. I had to do a little testing with ammo to get a few options that would run it 100 percent. Don't know if you shooting hand loaded shells or not but I found that it would run the wally world federals as well as the federal top gun in the blue box. Seems like it has to be 3 dram or better. I would say don't worry about it yet especially since you are new to 3 gun. I highly doubt it will be holding you back.
Have to say that wouldn't even be a concern of mine. Losing the money I spent on it would be the absolute least of my worries if I really had to use it in a defense situation.
I would definitely try a new extractor as well as slide stop. There is a spring if thats what you want to call it and that could wear out eventually. Also check to make sure its installed correctly. You can check your recoil spring by dry firing the gun and holding the trigger to the rear. Then rack and release the slide slowly easing it forward. If the gun doesn't go in to battery you need a new spring. I suspect the jambs are a result of the extractor though. Good luck and keep us posted.
Could you get it in the freezer? I would try leaving it in there a while and maybe things would loosen up just enough to get it out. I knew a guy that had a case head separation in a 9 major open gun and that worked for him.
Seems the general consensus around the internets is that the cci feed very reliably but the winchesters are softer. I personally have never had issues with the winchesters feeding on my press. I have had issues with them feeding in different types of primer fillers.