[wbarmy]

the little holes are for on the rear and front sight dials

If I remember correctly, you could use a nail, or a bullet, to turn the dials. Especially since they were kind of small and you might be wearing gloves.

[Gaffer]

You guessed it....the bullet tip of a round. Curiously, I think this was taken from some of the screws on an M1 Carbine. The front band screws were scalloped so that a cartridge rim could be used to unscrew them.