I'll step in it...
For AR lowers i look for two things. 7075 t6 aluminum, hard coat anodized, either milled from billet or forging. All holes cut, drilled, milled to spec. Everything else is personal preference. Some companies who mill their own receivers have better QC than others, just as some companies who buy finished receivers and have their roll mark applied have better QC than others. I will pay more to buy a receiver from a company that does their own work in house and has a track record of excellent QC along with great customer service should there be a problem. I wont pay more for any part just because of the name or roll mark.
Edited to remove douchiness.
For AR lowers i look for two things. 7075 t6 aluminum, hard coat anodized, either milled from billet or forging. All holes cut, drilled, milled to spec. Everything else is personal preference. Some companies who mill their own receivers have better QC than others, just as some companies who buy finished receivers and have their roll mark applied have better QC than others. I will pay more to buy a receiver from a company that does their own work in house and has a track record of excellent QC along with great customer service should there be a problem. I wont pay more for any part just because of the name or roll mark.
Edited to remove douchiness.
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