Hmmm, some sort of bullpup rifle based off of the Steyr AUG platform, but running on .308 Win with the 24 inch HBAR barrel. Eotech holo sight with 3x magnifier and an M203 (It's part of the gun so it still counts!!).
Would probably want a few longer barrels and a March scope as well. An integrally suppressed barrel would be nice, not sure how long though.
Ten mags would be enough, if double stacking was not problematic width wise that would certainly be of benefit. No need for the auto lockout button thanks, it just gets in the way. That should be all.......
Oh and several thousand 40x46mm grenades, not too fussed on type, as long as most of em are HE or HEDP definitely need some Thermo rounds though, just to see what kind of mess they can make.
Not worried about .308 Win ammo, can either buy or reload to my own specification.
That should be everything. I think.