Assuming that you have no idea what three gun is, I will assume you know nothing about weapons and shooting. Have fun with google.
You may think I am some kid on the internet who has never fired a rifle. I, unlike you, am far from being an "armchair general." In fact, my entire family has served proudly for the U.S Army, my uncle recently retiring from fifteen years in the Special Forces, a veteran of both Desert Storm, and the recent wars in Iraq and Afghanistan. Or I could ask my cousin, we graduated together, I went off to college to get my engineering degree, then join, him going straight in and he is now a Ranger set to deploy to Afghanistan for the second time. I am a lifetime member of the NRA, and I am an avid shooter
I am far from being a troll, I just hate 15 year olds who think that they know everything about everything, and like you said, they haven't even fired a rifle aside from COD.
Now that being said, you cannot take manuals from the seventies and suddenly assume that is what everyone uses, because frankly, I feel that you are retarded, and falling as far down as draganathan...
Oh, and to prove my point, here is a few pics of my cousin firing an EBR, notice there is no "sternal hold."
And if you still don't believe me, fine. I have no need to show up some flamer on the internet.