Suppressor-height sights: will your irons co-witness?
No co-witness with standard-height irons.
Suppressor-height irons are the fix, and how well they work depends on two things: whether there is a plate
under the optic, and whether its emitter is open or enclosed. Each one lifts the window.
The fit checker’s own co-witness verdicts, for the category. A specific pair’s page adds
what its optic’s window size and its pistol’s factory sights change.
Why, case by case
Open emitter, direct cut, suppressor-height ironsCo-witnesses. A ≈0.290–0.315 in front sight normally sits in the lower third of the window on a direct cut. Mounted directly, the optic sits as low as the slide's cut allows, which is the best case there is for a fixed-height front sight to reach the window at all.
Open emitter, on a plate, suppressor-height ironsMarginal. Suppressor-height irons and an open emitter usually co-witness on a direct cut, but a plate lifts the optic and can push the front sight to the bottom edge of the window or below it. Check the plate's deck height before ordering sights.
Enclosed emitter, direct cut, suppressor-height ironsMarginal. Enclosed emitters sit taller, so suppressor-height irons often land at the very bottom of the window or just under it. Taller-than-suppressor-height sights are the usual answer here. Mounted directly, the optic sits as low as the slide's cut allows — usually the best case for a co-witness — but an enclosed emitter's own housing height gives most of that back.
Enclosed emitter, on a plate, suppressor-height ironsUnlikely to co-witness. An enclosed emitter on top of a plate puts the window above where suppressor-height irons sit — plan on optic-only, or sights taller than standard suppressor height.
This is the same lower-third co-witness rifle shooters know — the front sight low in the window, under the dot — and it's the usual target for suppressor-height pistol irons too. Pistols just don't standardize it the way rifles do, though: nothing ties one maker's sight height to another's optic height, so treat this as the typical case for the category, not a guarantee for your specific sights.
Check what’s on your slide
“Standard” and “suppressor height” are categories, not
measurements, and the model name on the box doesn’t always tell you which you have.
On 4 models tracked here, factory sight
height varies by SKU or production run badly enough to note on the page:
Something on this page wrong?Say what it should be. Corrections from someone who owns the pistol are why
this is worth more than a spec sheet — and nothing here changes without a source, so bring one.