The finish is only half of the battle. It has to feel battle-worn too.
And the only way you get that is by shooting the absolute shit out of it. The smoothest actions in the world when you pull the charging handle aren't produced by lubing them up, cleaning them all the time, throwing them in the back of the truck or down a driveway.
People can tell. Well-used guns with authentic finishes have a different feel to them. When you throw alot of rounds down range with them, the actions become buttery smooth. That's part of the experience as well.
People nailed it earlier. If you want the authentic battle-worn look and feel on one of them, use the heck out of it. Get 10k rounds of cheap blasting ammo and shoot it over the course of a month. Never put the rifle in the case. Throw it down in the mud, or in the back of a truck, or a trunk...get it dirty. Use a dirty rag to wipe it off...use the dirt as some grit.
Shoot it up against trees, fences, and other barricades. Carry it slung around the range, your house, etc.
All that stuff will start to really develop some natural wear and character. Throwing it down the driveway is ridiculous. It's one thing to scratch the anodizing up a bit; it's another thing entirely to gouge the absolute shit out of the aluminum, which concrete will absolutely do.