Hi LEO, I've got the exact gun you are talking about and I absolutely love it. It's a Sartan Gunworks by Remington, SPR94, 12GA/308WIN with screw in choke tubes.
I mounted a matte Leupold Vari-X III 1.5-5 scope in Warne 7.3 series low rings. I milled cross slots in the 11mm scope rail so I could use the recoil keys that come with the Warne rings. I makes them work like Weaver style rings and bases.
I got an Allen shotshell buttstock shell carrier and did a little cutting and sewing on it and made a carrier that holds 3 shotshells and 4 rifle cartridges. This is really nice for a quick reload.
The 308 will group < 1.5" @ 100yards and the choke tubes really makes the 12GA versatile.
This past summer I got 11 groundhogs with my combo gun. 7 with the rifle and 4 with the shotgun.
This deer season I got 4 deer, 3 with the rifle and 1 with the shotgun. I used a handload that pushes the 150 grain Nosler Ballistic Tip to 2850 fps and it worked GREAT on the deer. I used a Federal, OO Buck, 3" Magnum and the full choke tube to take the 1 deer with the shotgun and it dropped like a rock.
I hope to get a turkey next, or maybe some rabbits, or squirrels, or a grouse would be nice or a coyote would really be exciting, or maybe a,,, Well you get the picture. This is a great gun for all of the hunting I do.
Good Shooting!
Slufoot