Aftermarket or Glock? If aftermarket, what brand? I have a Storm Lake 9mm conversion barrel that I use for target practice that I've been happy with. I don't plan on using lead bullets, but I will be using range reloads for target practice. I want the .40 cal barrel to increase my ammo options as finding .357 SIG can be a little difficult (especially after the internet ban goes into effect in CA). I may also use the .40 cal barrel in my G32 for SD purposes, so reliability is very important. Thanks!