Thanks for the feedback.
I bought a M2 tactical 6 weeks ago, beautiful gun that operates really well, but I have been getting a really sore body, feels like muscle strain, bone bruising who knows what but gave it a rest for a week and tried shooting again today and still sore, right chest wall about 1.5-2" below the clavicle, was just wondering if the M4 would recoil much less.
Been shooting pumps for years and never had this issue, wondering if I have been firing a lot more shells maybe, Also wondering if since is my first semi if I am not setting the body up properly before pulling the trigger again, I guess a pump almost forces you to adjust the body before pulling the trigger again.
Not really sure but seems like the difference in recoil the M4 will probably not make much of a difference.