Z-RAM Z-Extension + Powerkit.68 V2 for Umarex HDR68 TR68, export valve 16j Version (30–40 J+) Z-RAM Z-Extension + Powerkit.68 V2A for Umarex HDR68 TR68 16J Version (30–40 J+) Ready to break limits?. This set is made for those who want to transform their standard 16 Joule HDR68 or TR68 into a high-performance marker with serious impact.
eBay