HDPS HK UMP/USC (.40 S&W/.45 ACP/9mm) Stock Block B - Push Pin
This sling pin will replace the current production stock Block B hardware and upgrade to the Sling Pin Pull Style version.
New Latest Production HDPS HK USC/UMP Stock Block -B Pin Style
For use with all HK UMP factory or US-made folding stocks. Each unit comes with a new push-pin design. This is a required part of the HK...
Quick Detach Sling Pin for Stock Block B - USC, UMP
This Ambidextrous QD Sling Pin allows you to replace your Push Pin Style or Eyelet Sling Loop - Style Pin in your Stock Block B for use of a...