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