Worked out the kinks - Matador Arms Mat-9K 5 inch 9mm Upper Reciever

This product started out needing some kinks worked out, for example initial production seemed to produce some fitment issues as well as the followers in magazines being chewed up. I have been in contact with the matador team and actually was invited to their shop where I observed the upgrades and alleviation of these issues. The stated they are also going to be including a troubleshooting card for lowers that aren't the dedicated Matador lowers. I am very happy with this product as well as the responsiveness and essentially no questions asked replacement policy. Great product and great team.