Z-RAM ZDR50 vs ZDR50v2 for Umarex HDR50/TR50: Which Housing Is Which?
The original ZDR50 is the housing introduced around HDR50/TR50 internals and a concealed Z-Extension. ZDR50v2 is a separate body-kit design associated with the EX25 valve. Black housing and grip-color choices do not identify the...
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