When stripped out of Bipod, M2 browning is more plausible as support weapon for power armor-clad soldier, fifty rounds of ammo is about 10-11 kg when packed with a linkless belt.
As for Avenger, impossible, and even if possible, totally impractical. What with it being the size of a Volkswagen and all (total system roughly 6.1 m long, massed 1820 kg), and enough recoil to make 7 ton aircraft fly backward from standstill...
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