With 60 years of continuous service, the AR15 has seen a number of enhancements to improve the survivability of the end user. Most critically, the introduction of the MIL-STD-1913 rail, AKA the Picatinny rail. The rail has standardized the employment of red dots, variable power scopes, thermal electro-optics, white lights, and lasers to allow for positive identification, de-escalation, and ultimately more accurate engagement in a no-fail encounter.