>>64150990
I mean yes but actually 7.62x39 only loses about 100 fps going from 16" down to 12". Wagner mercs carry an AK-103 for CQB and an AK-74M for longer range engagements.
>>64150994
It was the obvious thing to do. It was obvious that the Red Army needed something that could bridge the gap between their shitty nuggets and PPS submachineguns for modern mechanized warfare.
>>64151016
The biggest advantage the 5.56 and 5.45 cartridges have over 7.62x39 are of course weight savings and cpr. Essentially they're the ideal cartridges from a government bean counter's perspective. The Pentagon hastily adopted the M16 and 5.56 during the Vietnam War because American GIs were getting mauled in the jungle by VC armed with Chicom Type 56 AKs. The Pentagon's logic was that most American boy scouts were already familiar with shooting 22s at home, so they could just take a literal squirrel cartridge and up the power a little bit so they could just hose down the enemy with bullets. Then they figured out that telling their troops to spray and pray like that negated the advantages of being able to carry more ammo, so they created the M16A2 with a three-round burst limiter and target sights because the muhreens were obsessed with the rifleman meme and Camp Perry matches. Somewhere along the way they forgot that an assault rifle was supposed to be a souped-up submachine gun (i.e. how most of us are configuring our ARs today).