Accuracy has never before been so easily attained than with the Firefield series of in-chamber red laser brass boresights. The Firefield brass boresights deliver precision accuracy without wasting time and ammo at the range. Once placed in the chamber of a firearm, the red laser dot appears exactly where the barrel is pointed, allowing the weapon sights to be adjusted to the theoretical impact point. Durable brass construction means you'll be able to reliably use this boresight for years. Easy to pack and travel with, the Firefield brass boresights feature a compact, lightweight design that allows you to carry it wherever you go, from the range to the field. Specifications Laser wavelength nm 632-650 LED type visible red laser Power mW 5 Battery 2xAG5 or 3xAG3 Battery life hour 1 Range for sighting yd 15-100 Dot size in 100yds 2 Operation on/off end cap Construction brass Temperature F 10-50 SOLD QUANTITY 1