Reply To: Steel receiver modification?
Just a good set of gunsmith screwdrivers and a set of USA made allen wrenches. The Crosman uses standard fasteners. And yes, take care with the tiny forward screw which is under the bolt! From what I have read, if you mount a Williams or Crosman rear sight, the front sight post may be too short and cause your gun to shoot high. This is one reason I haven’t done the steel breech on mine yet. Check out the green Crosman forum, lots of folks doing custom mods to their 13xx pumpers and 22xx co2 guns.
PS-warning! you are entering the territory of obsession, welcome!