• Locking detent • Low profile, solid 4140 steel and 6061-T6 aluminum construction, solid locking detent with button release, and mil-spec finish • Unlike other adjustable sights, it is also a ranging sight • The unique rotating multiple aperture disc has 5 apertures preset to specified distances, 0=25 and 200yds 3=300yds 4=400yds 5=500yds 6=600yds • 070” aperture diameter