GSM Site-Rite Chamber Cartridge Laser Bore Sighter .40/10mm

The GSM Site-Rite Chamber Cartridge Laser Bore Sighter for .40/10mm is a precision aiming tool designed for shooters who demand accuracy without firing a round. This laser bore sighter eliminates the guesswork from zeroing optics and iron sights by projecting a laser beam down the bore axis, allowing you to verify sight alignment and impact point correlation at the bench or in the field. Law enforcement, military personnel, and competitive shooters rely on chamber-loaded laser bore sighters to save ammunition, time, and range costs during the critical zeroing process.

The Site-Rite design functions by inserting directly into the .40 S&W or 10mm chamber, where the laser emits parallel to the bore. This method provides superior accuracy compared to muzzle-mounted laser devices because it originates from the actual chamber—the true point of bullet origin—eliminating parallax error that can accumulate over distance. The compact form factor (3.6 x 1.55 x 7.35 inches) and lightweight construction (0.15 lbs) make it portable enough for field kit integration, while the precision engineering ensures consistent bore alignment for pistols chambered in both .40 S&W and 10mm Auto, two of the most common duty and defensive calibers in use today.

This bore sighter excels for shooters transitioning between firearms, duty weapon qualification prep, or zeroing newly mounted red dots and reflex sights without expending defensive ammunition. Law enforcement armories benefit from batch zeroing prior to duty rotation, while competitive shooters use it to baseline loads before live fire validation. Simply chamber the bore sighter, activate the laser, and align your optic or sights to the laser point at distance—a process that typically takes minutes and costs nothing in ammunition. Verify compatibility with your specific .40 S&W or 10mm platform before deployment to ensure proper fitment and safe operation.