Got the scale.
Mount - 184.93g/6.52oz
Flashlight - 82.60g/2.91oz
Red dot - 278g/9.80oz
Gun - 630g/22.22oz/1.389lb
Ammo - 118.6g/4.81oz (10 JHP - 115gr I believe.)
Total = 1,294.13g/45.65oz/2.85lb
The gun+ammo was 1.69lb
Everything is 2.85lb
So the mount and current accessories add 68.7% extra weight. But it's still under 3 lbs. I'm more than fine with that.
Unloaded, it's just .2 lb more than an M1911 and .2lb less than a S&W 686 .357 Revolver.
(other guns weights from wikipedia... I assume they are right.)