Hi All, long time lurker, seldom poster here. But I do appreciate the pool of knowledge.

Lately I've been considering an AR style rifle, and I think I pretty well understand the M&P 15 family. My question is about the rifling twist. Although I thought the descriptions talk about a 1 in 8" 5R (which I believe is a progressive twist rate), every rifle for sale at retailers/distributors shows 1 in 9".

So, it begs the question(s): are the retailers/distributors wrong, is the S&W description wrong, or did something change, and the retailers/distributors have "old" models?

Thanks for any responses,
Jeff

-jb