Hornady - LNL OAL Gauges Controlled Depth Tapered Reamer The system evaluates your performance

The system evaluates your performance by measuring the milliseconds before

It screws into the front tunnel sight (diopter) and provides magnification as listed above

Designed specifically for target shooters

Central illuminated point in intersection

Hornady - LNL OAL Gauges Controlled Depth Tapered Reamer The system evaluates your performance(Curved) For all autoloader, lever action, or pump action rifles. Also fits all bolt action and single shot firearms. Inserts into chamber through ejection port. Not compatible with Adapter "D" or short bodied cases. (Straight) Regulating seating depth and the resulting "jump" to the rifling is widely regarded as fundamental to improved accuracy. A few thousandths of an inch change between the bullet and the rifling can make the difference between