Inclined to agree with this....Disagree on the MCX.
It's a nice platform and there's TONS of interest but the unless they up their production... parts, conversions, stocks, guns etc are hard to come by and when they do become available, they're selling at a premium. I've bought a couple with the LE/SIG APP and there's usually been a significant wait (6+ months). I'm only setup with a few distributors but they've all be VERY limited on anything MCX in the past several years (eg only stocks and handguards with no conversions or complete firearms).
Parts are hard to come by for the current MCX. I don't anticipate the new version to be any better on availability for a couple of years at least.
It does run quite well if you can get one.
It's not that light. My XCR and MCX, similarly equipped, are a few ounces apart. The Virtus barrel profile killed any weight savings the legacy version had.
It is convertible.... 5.56 or 300? 7.62x39.....? (308, 6.5 or 6.8F eventually on the "spear"). XCR still kills it and anybody else on conversions.
Sig has sold the "cool factor" of the platform and there's interest but they haven't delivered on their 762x39 and there's as many versions/gens in the MCX life span as there are for the XCR for a similar time fram.
I like the MCX but it's not the answer for the masses. (neither is the XCR)
RA DOES need to work the Social media angle.
I've got a 6.75" legacy MCX in 300 that shoots great but my 7.5" 300blk XCR is more fun(but a little more gassy).
SIG USA is also notorious for making something...then changing it/discontinuing it and then you can't get it anymore or replacement parts. Yes, RA has done this too, to a much more limited extent...but they are a tiny company by comparison and do still manage to often due some pretty custom things for customers.