C2A1
 

I'm sure this is a bad time to bring this up, but it was an ongoing problem even before the latest "outbreak". I would like to update/replace my soon to be out of date filters. Specifically, I need 3M FR C2A1 filters and all I'm getting these days are back order excuses from various suppliers. I prefer the C2A1 because they are Mil-Spec NBC. If anyone has a line on these, or an equivalent substitute, please let me know via PM, or otherwise. Any advice on the REAL shelf live, beyond the date stamp, on these filters would be appreciated as well.

Thanks