Sightmark SM39043 Red Laser Boresight 300 Blackout 7.62x35mm

The Sightmark SM39043 Red Laser Boresight eliminates guesswork when zeroing 300 Blackout and 7.62x35mm rifles. This precision tool projects a visible red laser down the barrel axis, allowing shooters to align optics without firing a single round.

What Makes This Different

Unlike basic boresighting methods that rely on visual alignment, the SM39043 uses a Class IIIA red laser diode calibrated specifically for 300 Blackout chambers. The brass construction ensures consistent chamber fit across different manufacturers, while the included battery pack provides extended operation time compared to standard coin cell designs. This eliminates the common issues of loose fit and short battery life found in generic boresights.

Key Features

• Class IIIA red laser diode visible to 100 yards in daylight conditions
• Precision-machined brass cartridge case for exact chamber fit
• External battery pack with extended runtime and easy replacement
• Includes protective carrying case for storage and transport
• Compatible with 300 Blackout and 7.62x35mm chamber specifications
• Simple activation with no complex controls or adjustments
• Durable construction rated for repeated insertion and removal

The SM39043 performs consistently across temperature ranges from -10°F to 120°F, making it suitable for year-round use. Competition shooters rely on this tool for quick scope adjustments between matches, while hunters appreciate the ability to verify zero after travel without wasting ammunition. The laser remains visible at typical indoor range distances and provides adequate brightness for outdoor use in overcast conditions.

Technical Specs

• Caliber: 300 Blackout / 7.62x35mm
• Laser: Class IIIA red diode, 635-650nm wavelength
• Construction: Precision-machined brass cartridge case
• Power: External battery pack (batteries included)
• Operating temperature: -10°F to 120°F
• Includes: Boresight, battery pack, carrying case
• Manufacturer: Sightmark
• Model: SM39043

The SM39043 delivers the accuracy needed for precision shooting applications while saving time and ammunition costs. Professional gunsmiths and serious shooters choose this boresight for its reliability and chamber-specific design that ensures proper alignment every time.