Glock G17/34 9mm Luger 33 Round Pistol Magazine, Black w/Orange Follower, 1 Pack, 33, 65971

Often the last round will not fit until the magazine has undergone a break-in period. It is recommended that the magazine be loaded with all but the last round and left for a few days to compress the spring. Cycling the magazine from full to empty multiple times can assist in the break-in period.