I too have an STI Eagle with a Dawson front sight and a SVI magwell. I used it at the MS state match last year. I had just received it from Dawson and only had about 300 rounds through it, and had not tried it in the box yet. In the morning when it was cold and damp it fit in the box just like gun in the video. In the afternoon on the last stage where we started with gun in the box, it fit in the box without dragging. By then the air had dried out and the temp had risen 20 or so degrees.
Oh yeah, that's my carry gun too.