I concur it is a BFA on the M1919. The hole is way too small for a 30 cal or 7.62 barrel bearing for live fire. As well, if you blow the photo up a little you can see the radial gas ports at the base of the BFA along with the front wrenching feature. I have never seen a barrel bearing on a M1919 that looks like this one for anything but blank fire.
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