Re: Driving a gas gun vs a bolt gun
I used to be in agreement with lonmower's statement that gas guns are not as accurate as bolt rifles. If we're comparing AR's to benchrest rifles I would say this is still very much true, but if we're comparing any of the AR's that are being used in the tactical long range matches than I think there is very little difference on the accuracy issue. Certainly not enough to make a huge difference in scores. For example, my old Noveske built AR-10 in .308 Win would hold 1/2 moa with just about anything you fed it, and would hold moa out to 1000 yards with match ammo. My buddies new GAP built AR in 6mm Creedmoore is wicked accurate and is at least a 1/2 moa rifle past 300 yards! The last match I went to had several guys running LaRue 18" OBR's and they were doing quite well with them.
When it comes to driving a gas-gun I have found that the fundamentals are critical. Bolt rifles tend to be more forgiving, and having some flaws in your fundamentals probably won't be as apparent when shooting the bolt gun. I have had to modify my grip on the rifle to more of a pinch between the first pad of my trigger finger and the first knuckle of my thumb, and pay special attention to keeping the trigger dressed well through the recoil impulse when I'm driving the gas-gun. Squeezing the trigger directly to the rear of the rifle and applying pressure on the trigger that is perfectly centerline of the bore axis as well as keeping that trigger to the rear after the rifle has discharged and the bolt has cycled were the two items I had to work on the most. I also find myself floating my trigger hand almost completely off the pistol grip. I really had to get myself directly inline behind the rifle, so that the recoil impulse was driving straight back in line with my spine when lying prone. For me, these were the issues that helped with accuracy at distance. The recoil impulse on the gas-gun is definitely different, and you will probably have to modify some of things you are doing to better suit the unique properties associated with the gas-gun.
As mentioned above, look for any of the info that Jacob has put out as part of the Rifles Only/ Sniper Hide video instruction series. If you can, book a class at Rifles Only, you will come out of it shooting exponentially better!