I just got my 11 tapes about an hour ago, and yes it was the Glock. I was pretty lucky with tape spawns, but still had to earn them by getting through some tough rooms. 8 flying drones in an open area can be daunting... until you seek higher ground
I never used the burst fire, it's a waste of ammo. If you miss a drone and it's coming for you, just run away and change your direction frequently. Much better to get a another shot when it returns to idle than to spray and pray.
Calibre doesn't seem to matter much in terms of damage. Any hit on a flying drone that isn't the rotor guards or legs will neutralize it. Turret hits however seem to rely on a few factors but the most important seems to be at what angle you hit it. At distance the easiest thing to hit is the battery and motor housing. It's the brown boxy thing between the legs and the gun. You'll notice that it's fatter on one side, that's where the battery is. Any shot there will disable the turret, so long as it penetrates that is. Hit it at too shallow an angle with any gun and it will ricochet off the armour. Hit it face-on (either to the side , top, or rear) and you can guarantee a kill. Of course, you can go for the optics which is always a 1-hit way to stop it, but it;s a small moving target.
I never let myself get into a position where firing the last round from a weapon will leave me in danger, so it's not the extensive magazine size that matters too much. The front sight on the 1911 is quite fat, anything below it is obscured. The revolver sight is ranged quite short so you have to adjust high. The Glock has a narrow front sight an the bullet trajectory is very flat. The Glock simply wins out because it has the shortest time to aim and what you sight is what you'll hit.