It's the same every time someone offers the 'best way to finish military woodwork' question ...
Always great fun to read the contradictory ideas...
Right, my turn!
Under no conditions, is a glossy finish on Milsurp rifle woodwork acceptable to me, not ever, under any circumstances, no matter what....
First off, if the woodwork is as good as yours looks, then it's simply a matter of maintenance, simply palm in raw linseed oil, if it sinks in over a few hours, the wood needs it, if it doesn't, well it doesn't!
Then buff up with a cloth to a nice semi Matt luster.