AEK-971 has already been discussed on ATS plenty of times, but after I saw the full auto grouping clip I just had to put it up.
Out of every 4 shots the mechanism eliminates the recoil impulse of three shots, leaving the recoil of only 1 shot.
And that’s over 20 years ago.
As to Abakan, it’s not a viable military weapon in my opinion. To complex, expensive and to labor intensive produce, has a steel wire which is
prone to stretching after heated by excessive firing of the weapon.