I recently assembled a 7.5" upper and took it out to shoot. That's right, seven and one half inch barrel. I sited it in at 50 yards and 1" groups were easy off hand, no bags, standing. So I installed a red dot on it and started shooting at 100 yards. Soda cans at 100 yards are easy. Well one miss in a 30 round magazine. All these shots are off hand knealing.
My point is I am no bad *ss, but these rifles are accurate. The .223 is accurate.
+1 on any 16" getting 1MOA at 100 yards. Any barrel, Hbar, Disspipator, M4 or pencil. If it doesn't sell it, it's junk. Now if we are talking 1" at 200 yards with a 16" barrel, the only barrel to get is an Olympic Arms broach cut SUM barrel.
1" groups at 10 yards...that's pretty bad. That's 10" at 100 yards. I have 2" barrel pistols that shoot better.