Convert your 9mm Glock down to an Advantage Arms 22LR so trips to the range don't break the bank. Or if you want to teach your kid the fun of shooting but don't want him/her to start on the 9mm, a conversion kit is a great learning / training tool for your collection. This series is meant to fit Glock Gen 4 frames and includes one 15 round magazine, a 4.5 threaded barrel, a range bag, and a recessed cut for a variety of red dot options. It's the perfect tool to work on your muscle memory or to have some fun with your 22LR can.