Designed for pocket carry and self-defense, the Crimson Trace Laserguard Glock 42, 43 Red Laser Sight installs securely beneath the barrel for a smooth look and a smooth draw. These Red Laser Sights from the experts at Crimson Trace activate instinctively when you grip your firearm naturally. The Crimson Trace Compact Laserguard Red Laser installs without gunsmithing to the existing trigger guard of your Glock. The Crimson Trace Laserguard Front Activation Red Laser for Glock 42 and 43 is rugged enough to stand up to heavy recoil and still provide reliable repeatability time after time.