Mid December I bought one of their 80% polymer lowers they had on sale. I requested a multi color lower, which occurs when they change colors in their plastic injection machines. They do sell Blem lowers but that is NOT what I ordered. I wanted to make a nice lightweight 22lr AR. When I received the lower there were several issues. The pivot pin locations were out of spec, the buffer tube area was bent inward, and the bolt catch slot was too wide. I contacted EPArmory and was told to send it back and a warranty replacement would be sent. A month later I got the replacement and it was even worse than the first. For reference I'm a Machinist that designs and build molds for Plastic Injection and Diescast Machines. I gave EPArmory the benefit of the doubt that they would want to fix the issues they were having with their mold and operation of their plastic machines, and told them some things that they could do to fix some of the issues. They blew me off and said they have no issues.
Here are the photos showing all of the issues with these lowers.
Pivot Pin locations out of spec:
The front pivot pins are lined up with gage pins to a Quinten Defense Lower (that is milspec). Shows that the distance between the pivot pins on the EP lower is too far apart. EP lower measures 6.3975 center to center, Mil spec is 6.375 +-.002.
Pivot pin hole too far up (to the top of the lower). From the top of the lower to the center of the rear pivot pin hole measures .195, front measures .217. Mil-Spec is .25. With the pivot pins too high, it leaves a substantial gap between the upper and lower:
In the photo below you can see the gap between the bottom of the straight edge and the top of the EP lower.
(NOTE: The QD lower in the above photo has Blem writen on it because I engraved a logo too deep, NOT because anything is out of spec)
The bolt Release Pocket too wide:
You can see the comparison to a mil-spec pocket. This gives the bolt catch too much play forward and back and doesn't reliably lift when a mag is empty.
Buffer Tube area warped / bent:
The buffer tube are is bent toward the front of the lower due to improper cooling of the mold and lower as it is ejected from the mold. This also means the threads are warped and a buffer tube does not thread into the lower.
This isn't an isolated incident either. Seems many people on other forums that have a large community of 80% builders also have these issues (calguns for example). I would suggest anyone who is in the market for an 80% polymer lower avoid EPArmory like the plague. They have some major issues with their mold, operational issues with their plastic injection machine and no quality control. There are other Polymer 80% lowers out there to choose from that don't have these kind of issues.