This is a Crimson Trace Corporation Laserguard known as the Laserguard Pro, model LL-810.
LL-810 Laserguard(R) Pro(TM) for GLOCK Subcompact pistols is a powerful red laser sight and 150 Lumen LED white light in a single compact unit. This illumination and targeting product is activated with Crimson Trace's famed Instinctive Activation(TM)" which activates the unit via a front activation button when the pistol is held in a normal firing grip. The LL-810 features four modes of operation (see below)" a Master On/Off Switch" is completely user-installed in moments with no modifications to the gun frame and the laser is user-adjustable for windage and elevation. Offers 2 hours of battery with a single CR2 Lithium battery. This model will fit the following GLOCK pistols: 3rd Generation 26" 27" 33" 36" Gen4 26" 27" 33" and Gen5 26.
Features:
Front activation
Red laser
Factory sighted at 50Ft
.5 inch diameter at 50 feet
