Yes, there is a difference! Another design I wanted previously in an AR upper, went up steadily to over $2000 and that was just the upper. This one s a decent design and not one of those AR uppers that you have to open the action and screw out the breach with a big screw driver each time you take a shot. Yes, ammunition is expensive and I won't be abe to fire it near as much as I would my Milsurps. But, there is always the few surplus rounds to supplement the new factory made ammunition, which has recently became quite a bit more available. What I would do is buy the new rounds and save the brass for future reloading. I have been in aquisition mode for the past 15 years, and I am trying to work into shooting mode. A 50 BMG rifle "was" part of my aquisition goals because it was and still is, endangered from government bans. An AR upper, in 50 BMG is perfect, because, it isn't, by itself, a firearm. Therefore, it is ban proof. If you are really paranoid, then you can build the entire rifle from an 80% AR receiver.