Posted: Aug 6th 2010, 10:33 PM
Go for the Leupold Mark
AR in 3-9x, 4-12x, or the 6-18x. All three have 40mm objectives. The 3-9 x 40 is $300. You'll need rings, so you may want to find a used one. the bullet drop compensator is matched up for .223 55gr ammo.
About it:
The
Leupold 3-9x40 Mark AR Riflescope Duplex / MilDot 67165 67160 is ideal for those who hunt with
AR15/M-16 style rifles, delivering high performance at a price that's right on target. The
3-9x40mm Mark AR Duplex Rifle Scope by

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Leupold has a 1/2
MOA T2 elevation adjustment that includes a pre-engraved
bullet drop compensation (BDC)
dial to match the ballistics of most 55 grain .223 Remington/5.56mm
NATO loads. Long range shooting solutions for the tactical hunter have
never been easier. If the target is at 500 yards, simply turn the dial
to the "5" and squeeze the trigger. It's that easy.