BSS's are pretty consistent from gun to gun. Barrels won't just snap on but are close, so you need a decent gunsmith to properly fit them. My guy charged me only about $150 to fit the barrels, but then there was the forend fitting (wanted two f/e's for the gun) and the reshaping/checkering of the field f/e to match the original Sporter f/e, and the oil refinish to make all the wood match. Then you need to find an appropriate two-barrel case. It now looks factory, and of course I have more in it than it is probably worth, but I'm happy.