Sightmark SM39026 Triple Duty Universal Green Bore Sight .17-.50 Cal

The Sightmark SM39026 Triple Duty Universal Green Bore Sight eliminates time-consuming range sessions for initial scope zeroing across multiple calibers. This precision laser bore sight works with cartridges from .17 to .50 caliber, making it an essential tool for shooters who own rifles in different chamberings.

What Makes This Different

Unlike single-caliber bore sights that require separate units for each rifle, the SM39026 uses expandable brass housing that adjusts to fit cartridges ranging from .17 HMR up to .50 caliber. The green laser operates at 532nm wavelength, providing visibility up to 100 yards in daylight conditions. Class IIIA laser output delivers consistent accuracy for preliminary zeroing before live fire confirmation.

Key Features

• Universal design fits .17 to .50 caliber cartridges with expandable brass housing
• Green 532nm laser provides superior daylight visibility compared to red alternatives
• Class IIIA laser rating ensures consistent beam projection up to 100 yards
• Precision-machined brass construction maintains chamber alignment
• Battery-operated design requires no external power connections
• Compact storage case included for transport and organization
• Works with bolt-action, semi-automatic, and single-shot rifles

Field testing shows the SM39026 reduces initial zeroing time by approximately 75% compared to traditional methods. Hunters appreciate the ability to quickly verify zero after scope mounting or rifle transport. Competition shooters use it for rapid sight-in when switching between different rifles during matches. The green laser remains visible in most outdoor lighting conditions, though performance decreases in bright sunlight.

Technical Specs

• Laser wavelength: 532nm green
• Laser class: IIIA
• Caliber compatibility: .17 to .50 caliber
• Material: Precision-machined brass
• Battery type: Included (specific type varies by model)
• Effective range: Up to 100 yards
• Operating temperature: Standard field conditions
• Includes: Bore sight, batteries, carrying case

The SM39026 represents practical engineering for multi-caliber applications. Professional gunsmiths stock this model because one unit handles most common rifle calibers. The expandable design eliminates inventory complexity while maintaining the precision required for accurate preliminary zeroing.