TRYBE Defense Magazine Extension Base Pad Glock 17/17L/19X/22/34/45 9mm/.40 S&W 4/5-Round Aluminum MAGEXTG174/5-AL-5RD. The TRYBE Defense +4/5 Magazine Extension Base Pad will add (5) 9mm rounds to any factory Glock 17/19X/34/45 and (4) .40 S&W rounds...