You are asking for something that is hard to find in an O/U.
LW 20 will recoil more than a standard weight 12 shooting the same 1ounce of shot. 7/8 ounce may get you there, but not by much. You can't reduce shotgun weight and shoot the same weight/speed shell without increasing recoil. Physics, and1oz target loads all fall within the same FPS parameters 20ga or 12ga.
Beretta for a lot of use with little chance of breakdown, combined with if it does, easy parts sourcing. Consider a recoil system that compresses the recoil pad for recoil reduction. However, they do screw the balance on a LW.
Other than that Beretta semi.
Last edited by battue; 08/29/17.