Product DescriptionAchieve precise sight alignment before ever firing a shot with the SME Sight-Rite Laser Bore Sighting System for 20-gauge shotguns. Precision machined from a brass casing, this caliber-specific bore sighter seats in the chamber and projects a high-output red laser down the bore to help you align optics and sights quickly and accurately. It delivers repeatable performance and includes three button cell batteries so you can get started right out of the box.Product Highlights Caliber-specific 20-gauge laser bore sighter for fast, reliable pre-zeroing Precision machined brass casing for consistent chamber fit and durability High-output red laser provides a clear reference point for alignment Includes three button cell batteries for immediate use Reduces time, ammo, and frustration during the sight-in process Specs Product Type: Laser bore sighting system Gauge: 20 Gauge Material: Brass casing Laser Color: Red (high-output) Batteries Included: Three button cell batteries Country of Manufacture: China UPC: 813628078111 Manufacturer Part Number: XSIBL20GA Brand Name: SME Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&&';;s manufacturer.