Empty chamber indicator for CMMG-style 22LR AR. Vertical nub clears a Catch-22 V2 bolt catch, shown. Two step files are included; one with 10 degree angled based to match MIL-spec lowers, and one with flat base to fit other receivers. ASA recommended to handle heat/sun of summer use without softening or warping. 

Includes small hole in bottom to attach hang tag. Shown with this one: [https://www.amazon.com/dp/B07DYD9GL8?](https://www.amazon.com/dp/B07DYD9GL8?)