Oops, I mis remembered, It actually fails to fire, typically but not solely on the last round of the magazine.
No need to sell it. Figure it's likely serviceable, but, it did not function out of the box. Purchased upon reading the generally excellent reviews and it was $250.
Give it a good cleaning and lube. Shoot at least 2 hundred rounds of nato spec ball ammo through it to break it in. Also there's a good chance the magazine is bad. put a number on your magazines for ID and see if only one mag is bad. Magazines are the heart of any self feeder. Magazines also have a limited life and need replacement if used a lot.
