Lage MAX-11 Upper, fixed sights, 600 rpm bolt, ¾-10 threads. It feeds and runs great, it has shot about 2000 rounds, all subsonic factory loads. In very good condition, rifling is sharp and undamaged from end to end, no scratches, rust or any other damage, just minor handling and use wear. Purchased three years ago and used lightly around the property since. Also includes the Lage external gas block, the one that attaches to the rear sight. A must have if shooting suppressed (IS THERE ANY OTHER WAY?!?!) Ill sell to my okshooters buddies for an $800 USPS Money Order and Ill cover the insured shipping to you. I may be able to meet you somewhere between Altus and OKC for a face to face. Feel free to ask any questions you might have, thanks!!