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.

Paul Seitz –
They look great and feel great 10/10 would buy again.
Walter Kopacz –
5*+++ This is the lowest co-witness (< 1/3 ) on the market with the C&H optic plate I purchased first. I put them on a glock 45 with a Leupold Delta Point Pro. I’ve had Staccatos, Bul Armory, Springfield Prodigy and this is IMOO, “THE” way to go in every manner , shape and form. I sure wished I’d heard of C&H beforehand, no lie, this Company is Top Shelf with a Customer Service to match. I believe you will not be disappointed, I am so very, very happy.