When I got my G22 home I started to wonder if I should obtain a match grade aftermarket barrel. My thoughts were full round support and increased accuracy. I wrote a well known barrel manufacture and their response is below. I found it very interesting/satisfying they were candid and did not simply promote a purchase.
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As long as you use good quality ammunition you should have no problem with this firearm. Like them or not they are reliable and shoot no less accurately than any other factory made firearm. Glock has manufactured tens of thousands of these models and have suffered no more failures than any other company out there. I would only replace the barrel if you find it's current accuracy insufficient but spend some time on the range shooting it before you decide on anything. UNQUOTE: