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as for the hammer, they do sell a spur that you mount to the hammer, that makes cocking it a lot easier with a scope on the gun, there not that much really
many times if you have a good gun store...

OK sounds like a fun deal
do you know what choke is on the barrel??
anything past Modified, might be a problem with slugs, most shotgun barrels for slugs are either open, cylinder, or improved...