The barrel length will have an effect on some gas guns. I know that the 11-87's with 26" barrels will sometimes choke on light loads. The longer barrels are more reliable. Mine gave me fits until well broken in. The people at Remington said it had to do with the gas having less time to build up pressure to work the action in the shorter barrels.
This is not a problem with the inertia operated guns, and seems to be less of a concern with some other gas guns.