I'm looking at scopes for my 20" AR-10. I went to my local Sportsman Warehouse with the intention of seeing if they had a 3x15x44 Gen II PST which they did not... So I tried a few Vortex scopes one of them was the PST 5X25X50 PST-5259, which seemed pretty nice and relatively clear as I read a sign on the opposite end of the store. I picked up a Crimson Trace Hardline 4x16x42 and wow... The clarity on the glass blew me away. Much brighter and clearer at higher magnification, nice eyebox. Then I did some reading.. It seems Crimson Trace and Athlon use Japanese-made glass versus Vortex which is either made Philippines or China? That being said my eyes weren't lying, at least I don't think they were. I'm still considering a 3x15x44 PST GEN II, would offerings from Athlon Ares BTR or Crimson Trace be an improvement over the Vortex glass? I know there's other things that make a scope such as turrents, tracking etc.