Not as good as free, but I have one of the Mellon air crowned 10" barrels on my 2240. It is very accurate. I think they are listed at $20
Well I owe OP an apology the barrel was a 177...I checked it to be sure...the 22 barrel was a stock length...I GOT EM MIXED UP....sorry pault58.....
The longer barrels are more. The 10" are under "other barrels". http://mellonair.myfreesites.net/barrelsI also have the silver power adjuster. With the 10" barrel and CPHP's, I get 464 ft/s flush, 485 3 turns in, and 422 3 turns out. http://mellonair.myfreesites.net/power-adjusters