Use this follower with current G/17,17L,19,26,34 magazines. For use in all magazines originally supplied with number 4,5,6 followers. Part number 33 on the Glock Schematic.
Here in California the 10 round glock magazines come with the 2183 followers, and they are known for their feeding issues. With these#6 followers and a small modification to the magazine, they will feed any ammunition from ball to hollow points. Never had any more failures to feed after installing these followers