I got the 550 barrel and I meant to get the 450, but I still love the look. The scar fits better than on the stock barrels(they weren't as loose as a lot of people's but still the 550 fit a little more snug) I love the aesthetic, to performance is similar to the included long barrel as far as fps goes. But as far quality on these barrels, it's bar none. And it arrived with my harrier very quickly, maybe 3 days and in perfect condition. OOD is my favorite place to get my blasters and mods, always good customer service and good quality. Have had problems elsewhere. If they have what I need, they get my money before anyone else.
