When a sturdy, reliable mounting system is required without adding substantial weight, APA rings are the answer. Machined with hard anodized black aluminum bodies and titanium beta series crossbolts and jaws. This combination provides exceptional strength. Choosing the correct ring height should be determined by using the shortest height that allows for scope clearance. Other factors that should be considered are bolt lift, eye level, and barrel. American Precision Arms True Lock Rings 30mm 1.125