Learn how to install the ICS Airsoft Revo Quantitave Gas Injection Valve with this video. According to the company, this valve increases the magazine gas injection capacity up to 30% with REVO Gas Injection Valve, releasing all the unneeded air pressure inside the magazine and inform users when the gas is fully charged. Another feature is its adjustable length feature, players can customize proper valve length according to their playing environment... "Attention: Please gently fasten the injection valve until the O ring is closely aligned with the hole on the magazine base, then slightly tighten it. Please do not over fasten the injection valve. Over fastening may cause damage."