A company called IC13 is working on a protective end cap got the KAK Shockwave. They are waiting for BATF approval before releasing it. The cap is designed to plug the end to keep out debris and to protect the fin in case the pistol is dropped.
I like the looks of it
https://www.ic13arms.com/shop/sbp-pistol-brace-protector
I like the looks of it
https://www.ic13arms.com/shop/sbp-pistol-brace-protector