I bought my dad a tasco 3-9 rifle scope for his birthday. My intention is to put it on his 870 12 gauge slug gun. I understand slugs will bust scopes because they kick like a mule on crack. They have really improved scopes on how shockproof they are. The mounting base on the gun is a Weaver bolt-on rail which mounts on using bolts in place of the pins in the receiver. I am assuming the scope might survive longer with the bolt on rail compared to if it was mounted on a cantilever barrel. Help!