[Britton J Wingfield]

If someone else has rezeroed my weapon to suit them, and then hands it back to me, how can I sanely expect to be able to hit anything when I really have to without rezeroing the weapon to my settings?

If you learn what your 'battle sight zero' then you can get your m-16 very close to zeroed before you is fire a shot. Mine is 6 left, zero down.

Then again, I was never taught this by any of the navy or marine instructors I've had. I learned it from an FBI type who gave us a little extra coaching one weekend.

Works like a charm.

[Darksheare]

My weapon was somewhat flaky in that respect.
That never worked.
It varied from 12 right and 6 up to 9 right and 4 up.
I asked the armorer about it, and he pulled out my weapon and showed me how loose the upper was from the lower.
Not sure if that was his answer, but the look on his face was interesting.
My drill sars told us that, but as I said, my weapon never did that well enough for my tastes. (I'm a bit of a perfectionist.. but then again, out of my unit, I was the only one to score the 300 meter target dead between the eyes repeatedly..)