Product DescriptionAchieve meticulous accuracy when zeroing your optics with the SME Sight-Rite Laser Bore Sighter. Precision-machined from brass for a reliable chamber fit, this cartridge-style sighter is caliber specific for the Winchester Short Magnum family and features a high-output laser to quickly align your sights or scope. It comes ready to use with three button cell batteries included.Product Highlights Precision-machined brass cartridge body for consistent chamber alignment Caliber-specific design compatible with .270, 7mm, .300, and .325 Winchester Short Magnum High-output laser simplifies boresighting and speeds up zeroing Includes three LR754 button cell batteries for immediate use Simple chamber-insert operation-no tools required Specs Product Type: Cartridge laser bore sighter Series/Model: Sight-Rite / Laser Bore Sighting System Material: Brass Style: Cartridge Compatible Calibers: .270 WSM, 7mm WSM, .300 WSM, .325 WSM Battery: Three LR754 button cell batteries Laser Class: Class IIIA (