I guess you could. I never have with any P226 I have owned. With subsonics you have less pressure so the added blowback IMO evens it out. Now if your shooting full house 9mm NATO out of the can then yes, it would not be a bad idea.
Thanks for the reply. This guys on the thread I mentioned showed some photos of some rails that were really chewed up. When I am shooting suppressed I like to do subs anyways, so I should be ok.
Found the thread.