Not every Blitz responds well to being moderated. Sometimes the back-pressure will cause it to fail to properly index the magazine when firing in semi or full-auto.
You will need this V2 adapter for the Blitz. This adapter has a 18x1 thread, It will not fit on a 1/2x20 moderator.
I highly recommend the Ronin .25/.30 M18x1 #S20A in the link below.