I recently acquired my first raider, and I wanted to mod it. My only setback was, I had never modded a primary before. I preceded extremeley cautiously, and the mod come out successful. First it was a standard air restricter removal.
Then I found some kind of heavy metallic tubing, and I thought it would be perfect for a barrel. At first the tubing wouldn't go throught the hole in the front of the gun, so I had to widen it. I secured it with pumbers goop and I closed the gun up, test fired and it worked.