Is a box mag really necessary?
BTW, just busting your balls... I have one... the only gun it fits shoots over 500 fps and is semi-only. lol... it's about the fear when I pull it out of my bag immediately after I chrono.
The Grozny game is posted on TAC, but it's not actually in Tucson iirc, it's at the Santa Rita field. It's a little further out.
If you're planning on going, remember that you need a SEALED bag of Bios, and you can only use midcaps or lowcaps (no winding mags) in your gun if it's not a support weapon (and no, M4's with box mags are NOT support weapons).