https://www.gamespot.com/articles/red-dead-redemption-2s-weapon-customization-explai/1100-6462502/

Red Dead Redemption 2 looks to be a shockingly precise cowboy simulator, right down to some survivalist mechanics like hunting and dressing appropriately. All a real frontiersman needs is a horse and a trusty rifle, and Rockstar has taken the wraps off of your weapon selection in the upcoming game.

According to the official site, RDR2 has more than 50 weapons, each with customization options and ammo types to help determine stats like accuracy, range, and damage. Weapons will level up the more you use them, and they'll need to be kept oiled and cleaned to stave off degradation. You can customize with barrels, grips, sights, and scopes for performance, along with visual flourishes like selecting your metals, woods, varnishes, and engravings.