While a high caliber rifle are usually bolt operated for accuracy,
the 223 AR's have enough horsepower to allow you to squeeze-off several
shots before your prey hears the first report.
When mounting a rifle scope on an AR15, resist the temptation to
stack AR-15 rifle
sights because you lose cheek weld, vital for long distance kills.

Don't stack a telescopic sight over your
battle sight, you lose cheek weld
Instead, get a quick release for a picatinny rail and mount the
telescopic sight as close to the AR barrel as possible:

Here is a close-up of the AR-15 rifle scope mount:

Note the quick release mount so that you can
quickly remove it without loss of zero
Note that the scope blocks the charging handle, and you need to mount
an AR charging handle adapter to allow charging from the left-side only:

Add a charging handle adapter to make is
easier to load the AR