Looks great but experienced issues when releasing magazine - ZEV Technologies Universal Pro Magwell

I’ve been a big fan of Zev triggers and their connector, so I went ahead and ordered their Pro Compact magwell for the first time for my Glock 19, gen 4. The sleek look and design of the magwell are top notch and the finish is excellent. Install was a breeze and feeding a Glock factory magazine wasn’t an issue, but when I released the magazine, the release wasn’t as smooth as I thought it would be. Upon further inspection, I noticed the back end of the magwell didn’t sit flush with the interior rear portion of the frame and it was catching the magazine and scraping it when it was released. I’m sure this could’ve been remedied with a file, some time and patience, but for the price I paid, I expected more from Zev and decided to return the product.