Rufus Dawg is now making a tank butt similar to the blackstar one. I went on the site to order some and saw their threadcap kit for hp air tanks. DO NOT BUY THIS THREADCAP KIT! I tried putting one on and it immediately ripped, and the second one ripped when it was hit with air from degassing my gun! They are not even worth the $5 apiece that they are listed as!
Here is a link to the product
I am just putting this review out for other users! This is a very poorly made product! I just hope my tank butt lasts longer than my threadcap kit did.