Giles Farm

Yes, there's a weapon. The Enforcer a Blunderbuss (Or whatever). Some say that you can't get the weapon if you killed Giles, but I found that you can. If you have your dog, take him out behind the house (Make sure his treasure finding level is high) and he'll lead you to Giles grave and tell you to dig. You'll get a key. Take it to the cellar (The hatch is behind the house) and open the gate, and continue through until your dog tells you he's found another place to dig. Dig, and you'll find the Enforcer. If you helped Giles and he's alive, do the quest for his son and Giles will offer to sell the farm to you. Buy the farm at the farmhouse and in the house somewhere you should find the key to the cellar.

Hope I helped.

NOTE: You can't find the weapon if you don't have your dog, so try to get it early if you plan on picking anything other than "love"

Yes there is and like imaloony8.0 said you can get the key from his grave unless you want you want to be evil then fell free to kill giles but make sure you have at least a master melee and at least a steel turrant pistol and lvl 3 infrerno

Yes there is a weapon but it's not good(so I heard it is n iron or a steel something probably a sword) just do what everyone else said above