Modular Regulator System out of stock The FCR is designed to Kleur:Everglade The FCR is designed to work as a compact Chest Rig in standalone configuration The FCR accommodates 8 x M4 style mags with adjustable bungee retention which allows AK mags to be easy changed out Batteries: 1 x 18650 (included) Their experience staff is constantly improving and developing new solutions with a proud manufacturing heritage of “Made in the USA” MRS from Polarstar is a 3 inches tall compact regulator which threads directly onto the HPA tank