I have searched the web and just came up being more confused. I want to get a 9mm sbr AR lower, but can't figure out what lower to begin with. I will eventually be adding a upper hosting a Silencerco Octane 9HD suppressor on it. I don't have a preference on Magazine acceptance, since I will be starting from scratch, but from pictures on the web I like the vertical mag wells. Please give me advice and pictures when you have some time.