Mini Browning M1919 machine gun.
I believe it's one of these, a half-scale miniature in .22LR, once manufactured by Tippman Arms: D&D Guns - Tippmann .22lr Minature 1919 Browning belt-fed Machinegun (semi-auto)
Previously:
Various miniature firearms in action - GIF and video
https://www.homemadetools.net/forum/...877#post105666
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