STOCK BLOCK “B” for you Hk USC to Hk UMP conversion (Pin/Washer/Ring Style)
ATTENTION – Be aware that HDPS CORP is the only maker of Conversion Blocks (B and C) for the Heckler and Koch USC to UMP conversion. We have received emails with problematic Blocks made and sold by other manufacturer claiming to be a Block B. MAKE SURE IT IS ENGRAVED as you see in photos to avoid fitting problems with counterfeit Block B’s
STOCK BLOCK “B”- Come with long cross pin, washer and sling ring !!
The RIGHT and SAFEST way to perform your Hk USC Sporter Carbine conversion to Hk UMP Assault Weapon style
Proven part since 2003!