GLOCK 43 POLYMER 80 CAN BE FUN FOR ANYONE

I'm baffled. I purchased a 22lr revolver a couple months in the past, I wanted to lengthen the barrel by about two inches so I requested wherever I could purchase a substitution barrel on the manufactures Internet site, they explained which the gun was registered to me by the atf with a particular barrel size and if I improve which i would wish a b