I can't tell without a picture, so don't hang me if I'm wrong. If it's a 1999, 2000, or 2001 post ban SR-15 M4, then it's not a 14 1/2 inch barrel with a RAS, not RIS. RIS is for older M4s to mount things on. It's a 16 inch barrel with a press on fake bird cage just like the one on the LEGP. Now, if you don't like a muzzle brake in practice but like the looks, it looks very good in person. In the pics it doesn't look good at all. And it does protect the crown. I have both the LEGP and the SR-15 M5, which is the 20" barrel version. In ral life, the fake brake really acutally looks good. Knights produced less than 1000 guns for for the civilian market in 99, so you get a very limited producted if that kind of thing appeals to you. You won't see them in the next stall at the range. Take a look at [url}www.wizardsofaz.com/ar15dotcom/legp1.htm[/url] and tell me if that is what your M4 looks like. That's a RAS. List on the SR-15 M4 puppy is 1295..with nothing else on it, no grip, no scope. Folow the links above and you'll see my SR-15. It's a very balanced, well built weapon...fun. I've been experimenting with configurations since I got it. You will like it..you'll just pay for the like a lot.