It is the optimal length of the gas tube when installing. The upper receiver and the gas block to fit the mounting hole diameter at the time of the exchange (There is a need to adjust. )
-5KU Mid-Length Gas Tube (350mm) -Suitable for all M4 Series Airsoft Rifle Standard Size Outer Barre -Come With Dummy Gas Tube -Color: Silver -Length: 350mm -Material: Stainless steel -Manufacturer: 5KU
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