wouldn't know where to begin talking about that article.
guess i'll cover things that got left out instead...
the tests that led to adopting the M-14, which was the shortest ever issued rifle in US history, determined it superior to the original HK 91 designs, and the FAL. not sure without looking, but maybe the AR-10, also.
the heavier SS109 has slowed the bullet a lot. as did the short BBL on the 16-A4. but even the original rounds issued for the weapon didn't reach stoner's and the air force's velocity spec. then they slowed it even more looking for fixes in the problematic period of first issue in 'nam.
before WWI, john "God Bless Him" browning had approached the army with his schemes about creating a "light machine gun". something a guy could pick up and run to the next trench with. he managed to raise an utter firestorm of disinterest. from his own monies, he designed redesigned, and built the BAR.
when, as browning had told them they would the army was sent to europe, it was ready with everything but a production line...
browning outright gave them the patent to expedite the process.
the american revolutionaries took solid cover and waited for the brits, who were ordered to fight in rows of straight lines, with ample targets of chance for a round that missed the first row.
the US military small arms trailed woefully behind in technology compared to what the public had untill about the 03 springfield. still i'd pick an 1894 winchester in 30-30 over the '03 in 30-06 in baghdad.
there's a link here @ THR, the army had been desigining the garand for decades (+) before WWII even broke out.
the moro rebellion included an adversary wearing body armor, of sorts. [an I.B.A?] the government seems to overeact to same. the .357M and the 38 super were FBI generated vest specific designs. i read of a policeman in portland who was wearing a vest rated for WAY over the .22lr that hit over his heart and left him hospitalized long afterward. until the snakeskin concept gets fully developed, blunt impact trauma will remain a problem. the 7.62 plates in our current system are BAD heavy, not as big as one would dream of in a firefight, and so large they are awkward to shoot long or short iron [two handed] with.
$0.02
gunnie