Barrel length makes very little difference, I had a 100mm 6.08 bore HFC pistol that shot with a 2" grouping out at 160 feet. And it was bone stock, 300fps.
The critical factors in range and accuracy are the hopup and the compression behind the BB. My VSR runs a 6.03 barrel only 420mm long, and it's DEAD accurate at 240 feet, and still accurate enough to hit people out to 300 feet.
Besides, like I said, you can't compare a sniper rifle to a PTW, they are TOTALLY different platforms. Especially a springer bolt action vs an automatic, totally unfair. PTW's are damn accurate, but you can't argue that having an air nozzle fixed to your cylinder and in the guaranteed fully closed position is just plain better for compression and consistency.
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