SIGHTMARK SM39043 300BLK (7.62x35mm) Boresight

The Sightmark SM39043 .300 BLK (7.62x35mm) Boresight (Red) is a precision chamber-insert laser boresight designed for fast and accurate optic alignment on .300 AAC Blackout (7.62x35mm) platforms.

Inserted like a live cartridge, it projects a bright red laser along the bore axis, enabling quick optic setup before live-fire zeroing.

Fast Optic Alignment

Improves speed and efficiency during initial sight-in.

Benefits

• Fast initial optic alignment
• Reduces ammunition consumption
• Designed for .300 AAC Blackout rifles
• Clear laser reference point
• Ideal for tactical and sport shooting

Chamber Insert Design

Fits directly into the chamber like a cartridge.

Features

• Realistic 7.62x35mm cartridge form
• Stable chamber positioning
• No external mounting required
• Easy insertion and removal

Red Laser Projection

Provides a clear aiming reference point.

Features

• Bright red laser dot
• Indoor and outdoor use
• Fast sight adjustment
• Clear point-of-impact reference

Efficient Zeroing

Reduces time and cost during optic setup.

Benefits

• Fewer test shots required
• Faster initial alignment
• Lower ammunition cost
• Ideal for AR-platform .300 BLK rifles

In the Box

• Sightmark SM39043 .300 BLK Boresight
• 2–3x AG3 or 2x AG5 batteries (depending on version)
• Carrying case
• User manual

Technical Specifications