These are parts from a Bulgarian AK74 kit i got several years ago. These appear to be brand new, and are in excellent condition.
The parts are a Bolt carrier and bolt head, with matching numbers (6606) along with matching topcover (6606). Also included is the AK74 muzzlebrake from the kit, and the triggerguard. Included (not in the picture) is the U looking piece for the triggerguard, and a safety selector.
Price is $130 shipped in the lower 48. Payment must be cashiers check or money order. Items will ship once payment arrives.