I purchased a stock from AI a few years ago with the intension of building a rifle that reminded me of the M40A3 that I used in the Marine Corps. I have been out of the loop since then and recently want to finish the rifle. I am looking at putting a Remington 700 SPS Tactical .308cal into the stock and was wondering if anybody had any advise or opinion regarding the setup. The SPS has a 20" barrel which I haven't used but from what I remember 18" would shoot well out to 1000. I want the closest I can get to what I used to use and wondered if anyone had any range reports of the 20". Thanks