A curved 130 rounds MP5 mag. Along with our Hi-Capa adapters, use it to turn your pistol into a “machine gun” with 130rds per mag! This polymer magazine is compatible with our HPA Magazine Adapter – Hi-Capa. You can remove the “bullets” from both sides of the magazine and reveal the BBs inside, ideal to keep track of how many BBs you have and which magazines you have used. This MP5 magazine will not fit the first generation of Novritsch HPA MP5 Magazine adapter for Glock.