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While my guess would be around 15yds (Glock would measure in meters). The armorers manual notes that each rear sight option (6.1mm, 6.5mm, 6.9mm and 7.3mm) represents about ~61mm in bullet impact at 25m (about 27 yards). The fact they know that and report it makes me think they at least tested at 25m.
If you run a ballistics calculator like gundata.org on 9mm ammo, you'll see the difference between a zero at 15yds and 30yds is pretty negligible, so they could have used something else when designing the sights and still get pretty much the same result. If I put 27yds (25m) into gundata.org I get the data for 15yds so I used 30yds to compare against.
For the typical self defense calibers, the distances they would practically be shot at are going to be within point blank range (distance the bullet will hit a target without compensation for drop). A Glock front sight is ~.5" above center of the bore so at 0yds you'd be .5" low but at 5yds with a 15yd zero you would be .27" low and not get more than 1/2" high or low until over 40yds. Same with a 30yd zero.
I checked .40S&W at 15yds against the 9mm data and they were pretty close, .40 starts dropping a little sooner but not enough to justify a different zero.
If you run a ballistics calculator like gundata.org on 9mm ammo, you'll see the difference between a zero at 15yds and 30yds is pretty negligible, so they could have used something else when designing the sights and still get pretty much the same result. If I put 27yds (25m) into gundata.org I get the data for 15yds so I used 30yds to compare against.
For the typical self defense calibers, the distances they would practically be shot at are going to be within point blank range (distance the bullet will hit a target without compensation for drop). A Glock front sight is ~.5" above center of the bore so at 0yds you'd be .5" low but at 5yds with a 15yd zero you would be .27" low and not get more than 1/2" high or low until over 40yds. Same with a 30yd zero.
I checked .40S&W at 15yds against the 9mm data and they were pretty close, .40 starts dropping a little sooner but not enough to justify a different zero.