Optic/sight options for a slug gun

A red dot sight. I have a SIG red dot on my shotgun, it had a scope but eye relief was a problem for me too. No such problems with the SIG.

I put a cheap Pinty red-green dot optic on my Shockwave. It’s ugly but works reasonably well.

I put a intermediate eye relief scope on my shotgun to get the scope further up the barrel and away from my face.

I have a Burris 1.5-5x variable shotgun scope on my H&R ultralight slug gun.
Eye relief is acceptable , clarity is acceptable , I dont care for the diamond reticle, or the tiny field of view.
Not much help from me!
I do like the variable scope. I leave it on lowest setting until I know what shot I'm taking.

I also have a cheap chinesium RDS on my self-defense shotgun. Works great with both buckshot and slugs from my smooth 20" barrel.

I have a reflex dot for close range blasting and my scope have 4"s of eye relief.

My turkey shotgun does double duty as a HD shotgun. It has a Burris FastFire III on it. If I had it to do over I think I’d put a low power variable scope on it. The friendship between my eyes and magnification grows stronger every year.

Leupold shotgun model 1-4x20.

This: Trijicon MRO 2 MOA on a Beretta A400 Xtreme Plus. Had to use a rail to mount the MRO. Much better than the factory hi-viz front and mid bead.

Leupold 1-4x20, 1.5-5x20, or and what I would most recommend, the 2.5x20 fixed.

I, too, recommend that Leupold 2.5x 20 fixed power on a slug gun. My 12 ga. 870 dedicated slug gun has worn this one since 1989. At slug gun ranges I never felt the need for more X's, ( and that's with fully rifled barrel and sabot slugs), and at closer ranges the wide field of view is outstanding. Being a Leupold fixed power means it's tough as nails also; even fell out of a tree in the early 90's ( gun was unloaded) and never lost zero. Good eye relief, too; think the O.P. needs that also. While 2.5x is my favorite slug gun power, I know some guys want a little more and the aforementioned 1-4x and 1-5x are about all you'd ever need on a slug gun. I have a Leupold 1-4x 20mm on a 30-30 and it's a dandy woods scope considering my 30-30 has a little more "reach" than a slug gun... ... ..

I had a cantilever bbl on an 835 way back.
3-9x Leupold.
Shot a buck over 150 yards w it around 6x and a doe at 90.
3.5" chamber, rough bore..... and initially the cantilever didn't converge w bore axis
Shot over 100 slugs in 2 days bench testing, trying to find something usable. 3 inch WW fosters won.

No 3.5 inch Lightfields back then.

I switched to an 870 and D&Td my receiver.
4x Leupold compact.
Worked great