New AR-15 Lower, but where to go from here?
I just picked up a milspec AR-15 lower with internals and an ACE stock. I've been trying to figure out what upper I want to put on it. I already have a Ruger SR-556, so I was thinking about getting a .458 Socom or a .300 AAC Blackout for a little more power. Then I started thinking another .556 upper would be good because I have all this .223 ammo anyhow and both could shoot the same ammo and I wouldn't have to make the investment in a new caliber.
Oh, what to do? This lower is begging for an upper and I can't decide what to do. I'd appreciate some ideas with reasons for your choice. Thank you in advance.