Chambered like a regular round, the Sightmark 6.5 Grendel Laser Boresight helps shooters quickly and efficiently sight-in riflescopes without wasting time or ammunition. Featuring a visible laser that reaches up to 100 yd, day or night, it's ideal for hog and varmint hunters. Constructed from durable brass, the 6.5 Grendel Boresight includes an on/off end cap and offers up to 1 hr of battery life. It is designed to operate in temperatures ranging from 15 to 120 degrees Fahrenheit, ensuring reliability in various conditions. Compact and travel-friendly, the Sightmark 6.5 Grendel Boresight comes with a carrying case, making it an essential tool for precision shooting.