Weapon change.

Version 9 is needed for importing with a skeleton; if we're talking about replacing weapons, version 6 is sufficient.

As I understand, the author of the topic needs imports in general, and weapons are just an example.

Added 2 minutes later
I don't know how "common" this is – version 10... I won't claim anything, but, for example, many games that are released now (like football games), I tried to run on my 8, and it didn't work... I installed version 10 for testing, and the game ran... Maya 6 is an old program, like a "mammoth tusk." Maybe that's why it doesn't run on a NEW version 10 (even if it's a regular one).