Both are GREAT AR-15s . . . two of the best.

The Colt will run higher based on the name and MAY be a marginally better rifle.

However, the new M&P 15s by S&W MAY be just as good. If not, they are "close enough for horseshoes and hand grenades!"

Or . . . as others might say, "Close enough for home defense and zombies!"

I'd go with the S&W and spend the rest on magazines and ammo . . . and you'll never be able to tell the difference in the performance of the two rifles for their intended mission!

That's what I did, and I have zero complaints or regrets for doing so. The build quality of the current S&W M&P rifles (and their parts) is as good as any of the best, IMHO.

T.