Re: Bushnell Brawl 2012
Having trained/competed at R.O. with an AR10 and a bolt gun on different occasions, there are advantages and disadvantages to the gas gun.
Movers and multiple target engagements from a static location, eg. (5 hanging plates of differing sizes at 500 yd.s for time)favor the gas gun.
Having to take one shot from atop stacked concrete culverts, pull the mag, stow the mag,(dump pouch), pull the charging handle to the rear, (dumping a round), and holding it rearward with one hand while locking the bolt open with your other hand, while perched atop the culverts, before you can move to the next stage ...not as easily done as simply lifting the bolt handle and drawing it to the rear, (prior to movement), with the bolt gun.
Then, upon arrival at the next stage, (but not before),you must re-insert the mag, release the bolt, check to make sure it is in battery, put on the safety and get ready to take the next shot.
I've done it once with a bolt gun and twice with a gas gun.
Overall, I don't think the gas gun gives you enough of a speed advantage to compensate for the added hassle manipulating it compared to a bolt gun.