Designed specifically for use in Glock 42 pistols; Bright red 5mW aiming point is closer to the bore than any other; Manufactured with premium raw materials to ensure superior reliability; Programmable for steady or pulsing beam that makes target easier to spot; Distinct ambidextrous ON/OFF switch reinforces safe handling; Rugged internal design does not restrict holster or grip selection; Factory-aligned to stock ballistics for guaranteed POA/POI accuracy