Glock’s new Tactical Lights (LE/military only) were designed as an extension of the Safe Action Pistol instead of another aftermarket add-on. The Xenon illumination is embedded in the same high-tech polymer that Glock frames are constructed from. Maximum illumination continuity is achieved by the use of “smart” electronic components for optimal luminous efficiency. In addition to the red-laser options in the GTL 21, the GTL 51/52 offers a highly developed IR laser and IR lamp to support target illumination. In combination with an IR night-vision system, the GTL allows the user to monitor a target area without becoming visible to others.