Ahh...a thread I can contribute to! MY stepfather runs a firearms supply company in his free time, which means every once in a while I get to go to the range with him and give feedback on some products. Last time we went, I got to play with these babies On the left is a .338 AR-10 with an 8.5-24x variable zoom Leupold scope. On the right is an Armalite AR-15 in .223/5.56 with a 2-8x variable zoom scope and digital camo stock and grips. We tried to sight-in the AR-10 at 400 yards for a customer, but it was too hot that day. The target was wobbling too much in the scope from the heat waves.