Variable mark 4 scopes have less travel (not sure how much). Only the fixed mark 4's have the 140 min of elevation.
I use a mark 4 16x w ith a 30moa integral base on my AMAC. 100 yard zero is no problem and should hit the 50's max effective range (according to calcs anyway). I'm looking forward to confirming this soon.
The M107 is issued with a leupold 4.5X14 Mark 4 and is used quite a bit past 1000. OP needs to be a bit more specific because 1001 meters is past 1000. Are you talking 1001 or 1700?