I plan to try out my new M4 for the first time at the end of July. It's my first shotgun, and I'm going through a course in on Sept 12. I've got a selection of bird shot to try. Fortunately, I've got enough of the higher load bird shot for the class. If the gun cycles the lighter varieties I found, then I may try to stock up on them for the class.
This forum has been great. And I'm glad to see this discussion in particular.
I very concerned about recoil. My old body doesn't handle new tricks like it used to. So I thought about letting the heavy gun get even heavier. But I'll reconsider that. Whatever nimbleness I can have for the long training day may be more important, as you all have said. Maybe I should ditch the metal side saddle for the long day and not worry about picking out fancy forearms yet. I've already got an elastic saddle on the stock.
I'm pretty sure I should go ahead and install the extended mag tube. Do you all think I should wait until after the long day in Sept to do that? I'm sure plenty of the other guns will have less than 7-round mags, and I'm sure we'll be doing forced reloads sometimes anyway.