Hey guys, question... I recently received two +2 GLOCK OEM mag extensions, one with the number "1" on it and the other with a number "2" but they look identical to me. Anyone familiar with these, and if so will they run safely and successfully without a insert? I have the one with the number two on one of my G17 mags, anyone have experience running these without a insert? Anyone have the part numbers for the +2 OEM and matching insert? Thanks in advance.