The SN-3 is bomb proof solid. It is the kind of scope you can drive nails with. At 1600+, I presume that is a 1.5 X 10 which is a good choice for an AR-15. I had a 3.2 X 17 on my GAP .308 and it is a great long range optic. But that was a 1000+ yard set up and I don't see that optic as practical on a 5.56 carbine.
Use the "layaway" plan that USO allows and you'll wind up with top quality glass. If you were budgeting up to $1400, then you should find a way to get that USO.
Go on their web site and you can configure and price the optic with any options you want. Be warned though, you can run the price up real fast by adding options.

