The opening at the base of the hollow backstrap is fitted using a removable polymer plug that also presents a lanyard loop. Even though the G19X will take Gen3, Gen4 and Gen5 G17 factory Publications, the changes within the magazine properly aren't suitable with a few aftermarket styles and updates. https://glock59841.jts-blog.com/31902195/helping-the-others-realize-the-advantages-of-glock