THE SINGLE BEST STRATEGY TO USE FOR P80 GLOCK 17 FRAME

I am perplexed. I bought a 22lr revolver a couple weeks ago, I wished to lengthen the barrel by about two inches so I requested wherever I could buy a substitute barrel about the manufactures website, they stated which the gun was registered to me because of the atf with a specific barrel duration and if I improve which i would wish a brand new ser