This looks like a good scope for those who like to plink at certain rodents in the spring. The Nikon P-223 scope is preset to the ballistics for standard .223 rounds for an AR-15 and other .223 rifles, so the hold over is already calculated. It's an inexpensive way to get take some of the guess work out of shooting at longer ranges. Use your range finder to determine the distance, and use the corresponding reticle in the scope for that distance out to 600 yards.
Nikon scopes have a good reputation for optics, and at about $150 for the 3X9, it's a nice addition to the gun without breaking the bank. You can find them at local sporting stores and gun shops. To learn more about the scope go HERE.