Advantage Arms Conversion Kit: Convert your 9mm/.40 S&W Glock down to 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. The MOD series is meant to fit Glock 17/22 Gen 5 and includes two 10 round magazines"" a 4.49"" 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. Red Dot and Frame Not Included. California Legal.