I know the AR buffer is a totally different system than what I’m proposing. But still, I have an old spring and weight I could try with just a little widening on the shotgun hole.
Also, I realize the hole isn’t angled to kick straight back. But might I see any reduction in felt recoil?
(For those not in the know, as I wasn’t last year, you can easily change the weight in the AR system. LOL, didn’t know you can pop the spring with a car key! I went up to an H3 (heaviest) and it still cycles like a dream, even with crappy .223. Wasn’t sure how much difference I was feeling until a friend and I compared with his stock Aero. Holy shit did his kick harder!)
There have been product for shotguns on the market that go into that deep screw counterbore. I’m nor sure which ones are still on the market. I don’t know that any of them were any more effective than just adding weight to the gun.
The one I remember had mercury acting as a recoil dampener. No idea if they actually work.