Not planning to offer, but I sympathize with your plight. I currently own a stable of LH shotguns - 2 870 LH 12's, one for trap/skeet/hunt and the other for defense. Also have an 870 LH 20 that has shot a lot of skeet in 50 years, a LH .410 Claude Purbaugh conversion from LH 20, and an 1100 LH...
'Bout got me. The IMP on the loaded ammo puzzled me. Decided it was Ackley or RCBS Improved. Went back and looked at the title and saw /AI. Ackley, huh? I'd like to have it for my wife's Bob, and could probably be resized back to Roberts. However, you'd probably lose some in the process...