Great lower for a great price
I would give this lower 5 stars if it weren't for one problem and let me explain. My receiver was unfortunately part of a batch that went out with an oversized bolt catch roll pin hole that 17 Design is aware about. It was an easy fix and took me about 15 minutes. All I had to do was get a couple dollar threaded roll pin, the same ones that Aero uses for their M4E1 lowers, use a 6/32 tap and thread the hole, problem solved. And to be honest who doesn't like a threaded roll pin for the bolt catch over having to hammer that pin in the first place. Every other part of the receiver was great! Good anodization, milled very well, every other spring and detent hole was to specs. I used an Aero LPK and it went together just fine. Takedown pin holes are tight, safety selector hole was tight, trigger pin holes were tight. Everything appeared to be well within military specifications. I would also like to add that I test fit an Anderson upper receiver and it fit extremely tight, no slop at all. Other than their one slip-up with the earlier receivers, which even high end companies can have from time to time, this is a good receiver that I would buy again and again without hesitation.
