Michaels Machines USC to UMP Stock Block B w/Thumbscrew

For use with all HK UMP factory or US made folding stocks. Each unit comes with a thumbscrew  on one end and a slotted section on the other end.

This is a required part for the HK USC-UMP style conversion. Ultra light weight with a sling loop attachment point to conveniently attach a sling to the block. One of the best stock block currently offered in the market.