Would depend on the gun, I would think. Given that the basic load for a machine gun is over twice that for a rifle, it can’t be that much of a risk in the first place or unmanageable should it occur.

The LSAT linkless feed magazine had a feed sprocket which was driven by the operating rod / bolt reciprocation and rotated to move rounds through the feed path. It’s shown in the Textron patents for the carbine as the LMG was always to use the polymer loop belt.