Any 223 or 5.56 ammo works. Steel cased ammo generally is not as accurate as brass, but if you are shooting for center mass out to a couple of hundred yards steel case will be accurate enough. If your looking for MOA at 100 yards or more go with brass case ammo.
Believe me. You did not settle for the slant cut. Good price for an awesome gun. $350 seems steep to me for the AR mag option, but if you prefer AR mags go for it. I prefer rock and lock to AR mags. Never fall out and you don't make your hand sore smacking the bottom to seat the mag. I've had a couple that dropped out an AR on me when I needed them most because the mags were off a hair on the mag catch notches.
Don't judge the barrel thread by the photo. Often the photo is a stock image and may not be 100% accurate.
Edited by liberty -r- death, 05 May 2013 - 07:34 PM.