The M1D variant comes with a scope attached making a huge accuracy improvement. Shorter time to kill is a welcome change however be mindful of your ammo count. The modded M1 variant features a slightly improved accuracy and a significantly quicker fire rate is a tool of war to be vary of. It is advised to aim for the torso and only aim for the head if targets gets too close. Not the most precise weapon but in the right hands of a skilled gunner it can be deadly. The M1 variant: Fair damage, healthy dose of damage and a swift fire rate. The garand makes for good and versatile weapon, in my version of the mod it hold up to 8 rounds in it's integral magazine which can be put 1 by 1 or quickly stocked with a 8 round clip feeding the entirety of the magazine (followed by the famous ping which was a struggle to program lmao).
A quick firing one being heavily altered and modded m1 garand and a m1d garand in case you need something more accurate for the job. It puts the well known M1 Garand and other variants of it into the game.