Recently, I saw the ad for a threaded barrel kit for PPQ M2's offered by Walther. It comes with a spring. Apparently, Walther now realizes that different springs are needed depending upon whether the firearm is used with a suppressor. I wrote to Walther telling them that I received no extra spring when I purchased my Navy, and it was confirmed that a different spring ought to be used depending upon the presence of a suppressor. But guess what? Walther does not offer the spring for the Navy as an accessory. So my question is: When is Walther going to contact all purchasers of the Navy model and send them, at no cost, the additional spring???