The z10 I bought comes with a zhumell laser collimator. Ive heard alot of talk about how they arent very accurate and that they need collimating themselves.
I read those same things about the collimator, so when my Z10 arrived last week, I made a simple jig out of 4 wood screws and a scrap piece of 2x4. I checked it at a distance of 15ft (the arbitrary distance that my tool chest just happened to be from my garage door), and it was dead accurate. It could be that GSO has tightened their quality control in the years since those collimator reviews were written on this thread. I'll be interested to read if your test results are similar to mine.