Agency Arms is well known for their Glock modifications. They have just expanded their customization with their AOS. The Agency Optic System is a modular optic mounting system for attaching micro red dots onto Glocks.
The AOS has interchangeable plates for use with the top four micro red dots. Trijicon RMR, Shield RMS, Leupold Delta Point Pro, and the Vortex Viper. The AOS actually reminds me of the Unity Tactical ATOM. The ATOM also uses interchangeable optic plates. One aspect that the ATOM has over the AOS is they have a plate to allow the use of an Aimpoint T1 on a Glock slide. However, the AOS beats out the ATOM due to the rear sight. The ATOM repositions the rear sight forward and it is dove tailed into the slide. This positions the rear sight in front of the red dot. Agency gives you the option of choosing a plate that either has the rear sight in front or behind your optic of choice.
Why would you want a rear sight in front of your optic? The rear sight acts as a protector for your micro red dot. If you rack your slide off a hard surface,
Originally posted on The Firearm Blog