Longer than the original It has chamfers that help the spring to function It can be placed on the original tube but above all it is essential when you put an extension tube.
 
On the circumference it has millings that help the tank to be cleaned as the residues pass through the grooves and improve the sliding speed as the air also passes between the grooves and the friction surface is smaller.
 
It is made of an aluminum alloy that is slightly softer than the aluminum of the casings so as not to ruin the strike When in dynamic shooting the casings are modified to improve the loading of the weapon, this follower being longer than the original avoids malfunctions.