So I just finished an Aero M4E1 build. Has a gov profile 1/7 twist BA barrel. Before I bought the upper, I was searching the internet for this supposed "MOA guarentee." However, I've never actually seen it. I took mine out this weekend with about 8 different factory loads, after a 100 shot break in, and continuous cleaning. The best group I got was from Barnes precision 69gr OTM at about 1.25" The other was from a 6 dollar box of federal american eagle 62 grain fmj, at about 1.5". Tried Aguila, Hornady Vmax, Federal. I know its not me. I brought my brother out with me who is a far superior shot than I am, and he was getting the same groupings. Just out of curiosity, has anyone actually ever shot a sub MOA at 100yds with a BA? I have watched about 20 vids. Everyone says. "Oh i had a mirage, Oh I had a flyer, Oh it was the wind, etc. Thanks guys.