Thanks guys. We make many trips a year together between vacation and hunting/fishing trips. I think the experiences are covered and we also have 5 children so don't want to single out 1 too much and if something doesn't work for the next one....
I am leaning towards 10mm as he is starting to make his own trips with buddies and it would be nice to know he has some protection in his travels.
Also I am torn on a ar because he might not buy one on his own for a while and I get to thinking they might not be available forever.
He has a new knife every month so not sure if a knife would be something he would hold onto for a long time, definitely a tool for him and not just for cutting.
Thanks for the feedback