LaserMax Guide Rod Mounted Red Laser Sight for the Glock 20FGR, 21FGR & 21SF Model Handguns.

• Please Note: If any firearm has been ported, fluted or compensated either by the original manufacturer or by a gunsmith, LaserMax will NOT guarantee alignment. Custom alignment quotes for firearms may be obtained by calling LaserMax.

• Please Note: For Glock models 20 & 21 with Finger Groove / Rail Systems: A small number of units may require custom alignment due to Glock factory tolerances on the handgun receiver!