Maxim Defense Uppers and Aftermarket Ejection Port Covers

Discussing an issue you may run into when trying to use the Maxim Defense MDX series of upper receivers with aftermarket ejection port covers, specifically polymer ones, and demonstrating a solution to use these ejection port covers.

Links
MDX:510 URG review: https://rumble.com/v3ox9je-maxim-defense-mdx510-urg-review.html