Got to shoot the USID carbine today! Not the best bullets(old store bought single lube groove 405gr I had languishing about), but it was enlightening to operate the action in a live fire situation. Feeding was so smooth you couldn't feel the round going into the chamber. Extractor didn't work at first but freed up after a few rounds.
Bore was a bit rough, so it tended to need cleaning every three rounds or it would miss a 2 foot sqare target at 100 yards. If you didn't worry about hitting anything its strangely satisfying to operate. "Boo-coo" smoke and fire and shell cases flying aboot, interrupted by the annoying manual cocking operation.