The HWS EXPS2(TM) maximizes rail space with its compact size and allows for co-witnessing of iron sights. It has convenient side buttons to add a magnifier and features an adjustable, locking, quick-detach lever for easy attachment and removal.EOTECH's most popular reticle offered, the 68 MOA ring with 1 MOA dot provides three usable aiming points. The aiming points above are based on the following load: .223 cal. 62 gr. 2,900 vel. When using other loads and calibers, the operator will have to establish the ranges associated with the aiming points. The standard ring found in most reticles equates to approximately 68' (5'8') at 100 yards.The EXPS(TM) HWS offers multiple brightness settings offering quick adjustability to accommodate any shooting situation.