Apparently after the barrel has been used for a long while or a hundred thousand rds or so, the barrel begins to wear smooth on the inside which lessens and finally negates the intended backspin effect. Tippmann will re-sandblast these barrels back to the original roughness inside for free as long as you pay shipping. Call them up an ask, or send them an e-mail and post the reply here for the benefit of all.
It should be noted that the A-5 Flatline relying more on the roughness of the barrel and less on the curve and length wears out more quickly than the Model 98 Version.
Could we spell it correctly...please?
Take a look, you might be surprised.