The first thing to realise is that you have an AR Pistol and you are attempting to shoot it like a Rifle, It's not a Rifle its a pistol. I'm not going to talk about SIG Braces, The way I shoot my AR Pistol is the same way the young lady in the post above is shooting hers, except I use a sling to help stabalize it. I use a two point sling, Attached at the rear of the lower reciever and the left side of the Handgaurd (I'm right handed), I run the sling over my right shoulder, across my back and coming up under my left arm. I then push on the pistol causing the sling to tension and place the last 3" of the buffer tube against my right cheek. For me it is a very stable set up and gives decent accuracy for 50yds or closer. If you want long range accuracy, use a rifle. A short barreled AR Pistol with a SIG brace and a KAK tube will extend Pistol accuracy by a substantial amount. I don't use a SIG brace, also don't fault those that do, I consider myself a Pistol Purist (LOL).