I believe that media officer for sig, Mr Saint John, is the same MSG Saint John formerly of group and then later cag, winner of several best ranger comps, and a bad, bad man to stand across a battlefield from.
This captain made a whole bunch of errors in his report: barrel length, weight etc., and honestly doesn't seem to understand much of what he is saying, (which is par for the course for anyone in the officer corps). If this scathing report was written by a CSM of a line battalion or larger unit, or a door kicker in the ops community, it would be more credible in my opinion.
I also couldn't help but laugh at the desired weight load of 55lbs. Get outta here with that bullshit. A full set of XL armor with green plates was right at 45lbs iirc. That's where the development should be done is finding an armor replacement that is about 10lbs and leave them with m4's for a few more years. Maybe then every single infantry vet with more than a few years in wouldn't be lining up for knee replacements and back surgeries in the decades following their service. The m4 worked great. The .223 was enough, (especially when you understand how many bullets are wasted to hit one enemy solder, (it's thousands)). I'm sure the rifles are better than the capt said and worse than the sig report says, but ultimately the bail out for sig if the rifle sucks will be the same bail out KAC used when they gave us those garbage M110 rifles: "we built the rifle the Army wanted, not what we wanted to give you".