Bore Sighter 30-30/.25-06/.270 Cartridge Red Laser Boresighter From USA Offers the brightest green laser allowed by Law. Non-handheld class 3R laser product, &lt;5Mw power output. Compatible with 30-30 caliber rifles. Battery: (3) LR41 (Included) Easy to use. Reduces ammo waste. Wave Length: 650nm, Dot Size: 2" @ 100 yards Range for Sighting: 15-100 yards