The extension not only gives your pinky a comfortable place to rest, but it allows for extra capacity too. The extension will allow you to add an extra round into your magazine - hence the term "plus"
Not to be used with restricted capacity magazines.
Note: Will NOT fit XD45 or any caliber XDm magazine.
WARNING: This product can expose you to Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to - www.P65Warnings.ca.gov