The SCAR is not multi-caliber at this point. I assume the aftermarket caliber conversions you mentioned are from High Desert Dog, which are vaporware as far as I know.
What caliber conversions do you want? The 901 looks interesting, but I'm not sure about its performance in 308. Also, I think it is better to simply have different complete rifles in various calibers.
If caliber conversion is your goal, then the 901, ARX-100 (assuming Beretta releases a 7.62x39 kit), MCX, and LMT MRP are your best options. The AUG is also convertible between 5.56 and 9mm. If you're looking for a "cool" rifle, an AUG A3M1 fills this role well.
The Sig Sauer 556xi is not a rifle I would consider with Sig Sauer's poor QC/QA on the 556 series.
Frankly I think you are better off buying a quality AR fully outfitted with quality optic, light, sling, fore-end, stock, etc. then buy ammo and shoot your rifle. Parts availability and ease of end-user armorer level maintenance make the AR hard to beat. The AR is also ergonomically superior to all other current platforms. A BCM AR with KMR rail and BCM furniture would be my current choice.
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