C&H Precision BUIS (Back Up Iron Sights) were specifically designed to be used with the OEM Optic Ready Slides and Direct Milled Slides.
LowWitness is defined as a BUIS (Back Up Iron Sights) that sits between .075″ to .100″ into the optic FOV (Field Of View) which is equivalent to lower 1/6 to lower 1/8.
True Co-Witness blocks half of your red dot visible window / FOV while Lower Third blocks one third of your visible window / FOV.
Red Dot Industry Experts believe Back Up Irons should not be a vision blocker and should be as low as possible but still useable if needed.
LowWitness® Back Up Iron Sight heights provide you the lowest usable sight height without being a vision blocker “Everything you need, nothing you don’t”
DISCLAIMER: This product is not manufactured, authorized, endorsed,
or warranted by GLOCK. GLOCK does not warrant or represent that
this product is compatible with GLOCK pistols.
Roger Garner (verified owner) –
Fast and accurate service. The sights align perfectly on my Gen5 Glock 17 MOS with STO. Sights fit correctly in the factory slots. Very snug and solid. Gave excellent sight picture in the lower area of the SRO. Zeroing was easily done with the appropriate sight tool. I will certainly recommend this product.