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The "Bolt-Up System" is also used on the Daniel Defense RIS II (selected by SOCOM for the SOPMOD II program)
upgrading GBB require necessary skill & technique to dissemble the gun
Not Include Battery
It was named after the person who owns Systema
SHS Metal M4 Hop Up Chamber for M4 AEG Version 2 Gearbox reg_CO The "Bolt-Up System" is alsoSHS Metal M4 Hop Up Chamber for M4 AEG Version 2 Gearbox Metal Construction Design for Upgrade your Original Hop Up Chamber More Durable Suitable for M4 Series Airsoft Electric Gun AEG Version 2 Gearbox
