Advantage Arms Conversion Kit, 17-22G4MOD-CA, 22 LR, 4.49 Barrel, For Glock 17/22 Gen 4, Optics Ready, Matte Finish, Black, Fixed Sights, 10 Rounds, 2 Magazines, Includes Range Bag AAC17-22G4MOD-CA 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-CA series is meant to fit Glock 17/22 Gen 4 and includes two 10 round magazines" 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 just some fun at the range. Red Dot Not Included. California Legal.