lol
I agree with Mr. Sample on this. When you change the barrel length, you chance the sight radius. If you cut the barrel, you will need to have the correct blade for that length barrel. If you can find the sight blade you need, it could be used, but I would simply replace the barrel. Advertise the old barrel for sale here on the want ads, you will most likely be able to sell it if you ask a decent price and recoup some of the money you spend on the new barrel.