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.


Bryan Thomas –
The quality was fine. However, these are too short if you add the sealing plate to the rmrcc. Without the sealing plate they work, with gthe sealing plate they dont.
Michael Gascon –
After ordering the wrong set, when these arrived, I wasbsonstoked, Indecide to keep the other ones (for a direct mount slide cut) and just have a slide cut for them. I love the Low-witness sight picture, just enough if my RMRcc goes down for some fluke of a reason.
The rear sight has melted/radiused corners and are very comfortable for AIWB, even with a holster cut to allow a proper full-grip draw and not have your frontstrap riding the top of the belt like they’re its in heat.