Evike Competition Grade Airsoft Firearm Silicone Lubricant Oil Spray : 200Ml Large Can - (25170) Capacity: 200ml ; Silicone oil spray. Non-petroleum This item cannot be shipped via express / air services Ideal for many uses including lubricating gears, o-rings, plastic parts, etc ; Prevents metal-on-metal wear and corrosion Proper lubrication solves 90% of common Gas Blow Back problems ; The best all-purpose silicone spray on the market! For AEG & GBB: Spray into magazine bb chamber periodically to prevent dust build-up == For Valves: Spray into gas-in and gas-out valves to check for leakage and to inflate the dried o-ring seal to prevent mag air leaks == Silicon oils are used by technicians all over the world to test gas leakage, o-rings and valves == For Gas Blowback: It is a MUST that you lubricate your gun and keep it oiled for quality performance == There are many internal assemblies that may not work properly when dried