Quick Answer
To clean the gas system of a Beretta A400, first disassemble the shotgun, then soak the gas components in a cleaning solution for 30 minutes, and finally use a small brush and a cleaning rod to scrub the system. Use a lubricant to protect the components.
Disassembling the Gas System
To access the gas system of a Beretta A400, remove the magazine cap and the fore-end. Next, take out the trigger group by pulling it forward and releasing the latch. This will allow you to access the gas assembly, which consists of several components, including the gas piston, gas valve, and gas tube.
Cleaning the Gas System
Once you have access to the gas system, soak the components in a cleaning solution such as Hoppes No. 9 or equivalent for 30 minutes. This will help loosen any dirt and debris that may be caked onto the components. After soaking, use a small brush to scrub the inside of the gas tube and the gas valve. Next, use a cleaning rod to push a cleaning patch through the gas tube to remove any remaining debris.
Reassembling and Lube the Gas System
After cleaning the gas system, use a lubricant such as Beretta’s proprietary lubricant or equivalent to protect the components. Apply a small amount of lubricant to the gas valve and the gas piston, then reassemble the shotgun in the reverse order that it was disassembled. Make sure to properly torque the trigger group and the fore-end to ensure proper function. Finally, take the shotgun to the range and test its performance to ensure that the gas system is functioning properly.
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