Sup saw leaf. Here is my Armalite AR10(T).
AR10

I like it alot its pretty accurate. But like you I also prefer 5.56. Try going to bass pro shops they have the Hunting sale once a year and Q3131A is on sale for 2.88 per box. I also scored some 9mm for the same price.
ammo
What kind of Ar's do you have? I have a few Bushies and a Colt. Here is my ACOG on a Bushie.
ACOG
Here is my Colt.
Colt AR15A2
Oh yeah I think Sniper rifles were mentioned earlier and while I wouldn;t call this a "Sniper Rifle" it is a really great gun. Remington 700 in 7mm
Remmy