I recently discovered two crosman 380 rocket spearguns in my grandfathers back shed after he passed away. There in Bit of rough shape.would anyone know we're i could get a replacement handle and frame, don't need trigger mech as its more to keep his memory alive than use. I know crosman make frames for air rifles and they look similar. Are they compatible or could the air rifle/air pistol handle be modified to make the old spearguns look pretty again. Email is fairchild74@hotmail.com