I recently purchased a G17 Gen 4. My 10 days is up on 2/6/11. I'm now regretting 9mm and kind of want a .40, what do you think? I purchased the Glock as a range gun in the beginning but now realize it should have some stop power. _Should I buy a G22 Gen 4 and later on purchase a .40 to 9mm conversion barrel?_ I'm leaning towards that option pretty heavily right now (easily influenced by YOUTUBE videos). Is the barrel a bad idea? Is it accurate? Is the 9mm the way to go? Any help will be just that, so Thanks in advance people. I kind of rushed in to this buy after shooting the G17 3rd Gen, Sig, & Springfield 1911. I chose Glock HELP!! Thanks!