WHAT DOES EBR CHASSIS MINI 14 MEAN?

When fully collapsed, its duration measures just 39″. On top of that, its compact measurement can make it practical to move or shop; when combined with a suppressor, it results in being below 6 toes in complete duration.This chassis has long been manufactured for Ruger mini-14 but I'm undecided it is going to, And that i had hassle obtaining info