If the top rib is solid where the sights will be - I drilled and tapped 4, 8 x40 holes and installed a Weaver base from a Marlin in the rib of a 12 bore, 7 1/2 pound double. Shooting 484gr. lead balls with 190gr. of 2f didn't loosen the rib nor shear off the scope mounts. It was a 2 1/2-8X40 scope weighing well over 1 pound, so the system will take recoil. What didn't, was my shoulder and the wrist of the stock. I ended up cross-pining it. The first time I firedthose loads, it spun me 1/2 way around. I wasn't leaned into it for a rapid right and left. Practise makes perfect. Not sure what the recoil comes out at- probably about 70 pounds.