HOW GLOCK 43 80 PERCENT CAN SAVE YOU TIME, STRESS, AND MONEY.

I'm baffled. I bought a 22lr revolver a pair weeks back, I planned to lengthen the barrel by about 2 inches so I questioned where I could purchase a substitute barrel around the manufactures Web-site, they explained that the gun was registered to me via the atf with a certain barrel size and if I change that I would want a different serial number.N