NOT KNOWN FACTS ABOUT WHERE CAN I BUY A GLOCK ONLINE

I've a G22 that I purchased to get a responsibility weapon about 11 years in the past. I was going to purchase An additional Glock in .357 until I discovered I could just do a barrel swap on my G22. Issue is which manufacturer barrel and where to buy it? I from time to time CC it but mostly just shoot it with the variety. Simply click to increase..