the Battery Extension Unit (BEU) is designed specifically to relieve all stresses on the ARP9's components

4v Mini LiPo recommended

CONCAVE DESIGN FOR BALANCE

Tested with Madbull inner barrels and Madbull outer barrels

98 inches)

Prometheus EG Barrel 455mm/ Inner Barrel 9.6v the Battery Extension Unit (BEU)PROMETHEUS EG Barrel Series Inner bore width of 6. 03mm with a 0. 01mm tolerance! Solid BB stability and accuracy, made with enhanced stainless steel (SUS) material! Inner barrel bore width of 6. 03mm with a tolerance of 0. 01mm, made of stainless steel for superior strength necessary to maintain accuracy without the need for coatings. The barrel is arguably the heart of any airsoft gun and determines various performance factors such as velocity