Title pretty much sums it up.
The ACR was one of the more iconic weapons in the series. With the new way Breakpoint handles gunsmithing and weapon variants I'm not sure why the weapon wasn't the poster child (alongside AR platforms obviously) for said systems.
The "standard" ACR could be the US Army individual carbine competition version or ACR-C as some sources call it.
For variants the options are actually rather plentiful. Want to make a scout variant? Slap the og masada handguard (like the silver stake uses) along with magpul dmr stock they made. If that's not flashy enough throw Kinetic Research Group's stock and forend on it.
The shorty version could be outfitted with a much shorter barrel and the tailhook/pistol brace stock that was made for it. If you need it to look a little more unique, throw the original RemDef handguard you used in Wildlands on it.
Assault variant you say, equip the original non folding stock and either the tri-rail forend or the m320 compatible forend designed for it. If you really want to go off into left field with the variants, Templar Precision is finally working on an AK mag compatible lower. Aesthetically these fit the pattern that has been set for weapon variants so far. And this is just parts that exist irl. You guys seem to love throwing off the wall junk you cooked up on the guns so the options are pretty much endless.
Show the old girl some love. Someone has to since Bushmaster and Remington kicked the bucket