ARMS

The ARMS 40 family has several different variants. The ARMS 40L shown below is the basic low profile BUIS. It has two different apertures, and is under constant spring tension. To raise the sight into position, you pull back on the release bracket (located on the right side). The internal spring launches it into position, and holds it in place through spring tension. To retract the unit, press rearward on the sight body, and thumb the release bracket back back into place.