If you’re asking about the suppressor, it was the 12th model. The current equivalent is the Allen Engineering AEM5, built by the same man. I personally don’t know if they were issued with guns but I do know the OPSINC cans had been in use since as least Gothic Serpent(Gordon’s carbine had one) and the Mod0 was set up to use it.
A suppressor cover, I would think, wouldn’t have been issued. It seems like those, for the most part, are a recent thing.