Yes there is a small risk. See bellow another snip from the instructions. This is what we have found works best for our products.
During shooting, condensation is created inside the suppressor, containing amongst others ammonia (mixture of burnt powder and water). Failure to remove the suppressor within a reasonable period of time after shooting will cause rust to form in the gun barrel and could cause corrosion inside the suppressor. It is therefore practical to unscrew the suppressor after shooting on a range before packing the firearm for transport. When hunting, the suppressor must be removed after the end of the hunt. Store the suppressor so that air can flow freely through it and dry it out. If the suppressor is put away wet, a white powdery build-up will occur on the baffles. In this case spray WD40 over the baffles. When the suppressor is dry it is advantageous to spray WD40 into it. Avoid the build-up of moisture inside the suppressor as repeated exposure could lead to premature failure of the suppressor due to corrosion. If the suppressor is dropped into water, it must be fully dried before use.
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