Apparently, EP Armory’s lowers are injection-molded, not printed, and they claim that their build order is reverse of what Tactical Machining had written, with the sprue in the fire control group area constructed first, and the rest of the receiver molded around it, which would seem to make it compliant as constructed.
Check it out:
Tactical Machining has been in the 80% receiver business since 2008, and have AR-10, AR-15, and 10/22 receivers as well as a 1911 frame on the market. From what I’ve heard of the company they have a good reputation for quality, and the denizens of various forums seem to think they are the are some of the good guys in the business.
Monday night, they took to Facebook to try to explain why they think the Ares Armor raid occurred:
In regards to the 80% fiasco at Ares Armor, the legality of 80% receivers, and how you can avoid the ATF knocking on your door for buying an “80% receiver” instead of an 80% receiver.