[SteveH]

woops, wondering what a recoil system is... (tia for any clarifications)

[Secret Agent Man]

you chnage out standard stock with one that absorbs recoil, usually either some mechanical and/or gel-type padding

[Carriage Hill]

I use this on my Remy 12ga 870 Pump...

https://www.remington.com/shop/870-Police-SuperCell-Recoil-Pad%2C-Synthetic-LE-Express-Tactical/p/F301523

and on my Versa Max Tactical...

https://www.remington.com/shotguns/tactical/versa-max-tactical

and on my AA Beowulf AR-50cal...

http://www.shopalexanderarms.com/Products-_50_Beowulf.html?_ga=2.130978255.1398290806.1593051507-1936709666.1593051507