I've got a similar M3. I have an HK import, one piece 7 shell mag tube, hunting stock and rifle sights.
I don't know anything about installing an M4 stock on the M3 but I do have GG&G's bolt release pad, tactical charging handle, enhanced safety and follower. No problems with the bolt release pad.
Dunno.
I think you're right. I have no problems bustin' hand thrown clays but doves are asking a little too much from a combat barrel.
It's a better 3 gun shotgun than upland game shotgun for sure.
I've shot a couple hundred of that winchester military buck without one problem. I can't comment on the Wolf as I don't shoot it out of any of my guns.
No help - I've never patterned my M3.
I know the feeling. It's Benelli's red headed step child but I like mine none the less.