Well, I'm a short little guy with short arms, and really liked the shorter stock on the older models. I also like, from a carrying and shooting standpoint, the lighter barrel of the older models.

However, from a performance standpoint, the A2 is much better with a heavier barrel and much improved sights.

My mind set is, retro if you are making a Wall Hanger or preserving history. But if you are building a performance rifle, go with the newest and best designs.