Advantage Arms Conversion Kit: Convert your 9mm/.40 S&W Glock down to 22lr so trips to the range don't break the bank. The MOD series is meant to fit Glock 17/22 Gen 4 and includes two 15 round magazines, a 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. Red Dot Not Included.