[ROB at RAGE]

If you got a pipe/tubing cuter use it. You can also cut it with chopsaw for wood if it has a carbide tiped blade, coating the blade with some bees wax keeps it form getting loaded with aluminum. Clamp the tubing down and don't use your hands with the chop saw. A band saw with a metal or wood blade usually cuts aluminum well also.

If you have to hacksaw it, you can square it up on a belt or disc sander.