The Sightmark 357 Magnum/38 Special Boresighter is a compact in-chamber laser tool designed to make zeroing your revolver or pistol sights straightforward and repeatable. Machined from brass to mimic the dimensions of a live cartridge, it seats directly in the chamber and projects a precise red laser aligned with the bore axis, helping you set up optics or iron sights without firing a shot.

This boresighter is ideal for initial sight-in, scope mounting, and dry-fire training drills where visual feedback on point of aim is valuable. With an effective sighting range of roughly 15–100 yards and a small dot size at distance, it helps conserve ammunition while refining your sight picture for hunting, competition, or regular range practice. Sightmark’s attention to alignment and durable construction has made its boresighters a trusted choice for shooters who value efficient, consistent setup.

Key Features:

• Manufacturer: Sightmark
• Model: 357 Magnum/38 Special Boresighter
• Caliber: 357 Magnum / 38 Special
• Style: Laser Boresight Cartridge
• Material: Brass
• Laser Wavelength: 632–650 nm Red
• Sighting Range: 15–100 Yards
• Battery Type: AG3 Button Cells
• Included Components: Battery Pack And Carrying Case