i have shot a bunch of slugs through Tracker I i used to have, and also through a legal sawed-off Pardner. there is no fear if hurting the gun. recoil doesnt bother me much honestly and i like the slugs. but i used to plink 220gr '06's through a Handi-rifle just for fun. i'm a big guy and soak up the recoil well...i'd just like to find a scope mount that will do the same. but its a kinda moot point now, i may just JB Weld a Williams WGRS on this Tracker II since i have an USH20 coming to scope...
on the Limbsavers, there is no way it would cost $80. like Spanky said, slip ons are $20, and the "grind to fit" models are only $30. i have fitted a few of the grind to fits, its not that hard and well worth it if recoil does bother you.