The hk_mp5.rar file you have requested: Addons / Weapons / H&K MP5 Pack - 5.84mb is not available. Perhaps try browsing all files for the game Operation Flashpoint and upload any files you want to share or are missing. This is the only information we could locate:
This is a new weapons pack for OFP. It allows you to play with a few more weapons and other stuff. More details can be found below.