We wanted to provide an update after running this by the production staff. The area in question does indeed pose an interesting manufacturing challenge, as the feed lip & rear contour are formed at the same time. Consequently, there may occasionally be an appearance of a fold or crease. This does not affect the integrity of the feed lips. USGI style aluminum magazines from other magazines will also illustrate this “crease” to a larger or lesser extent.
If anyone has any concerns about the magazines you have in your possession, please contact us and we will get you a refund or exchange. Any product produced or sold by Brownells has our 100% Satisfaction Guarantee. We appreciate everyone here bringing this up, and we will work to remove this cosmetic issue from future magazine production runs.