upper parts kit
I'm glad they had it in stock but the ejection port door had some kind of drawing mark(s) all over it. Looked like it was a used part. Reply from customer service: Thanks for the review Stephen! One thing you might try to do is to rub a bit of oil into the ejection port cover. If you're not happy with the results of that, please go to https://www.stagarms.com/contact-us/ , select "Warranty/RMA" and send us a picture of your problem. Our team will gladly help you out!