Chris's Unofficial H&K P7 Website
   Offers information about the P7 series of semiauto pistols made by Heckler and Koch with an HK-4 annex.
   http://www.hkp7.com/

HK91.com
   Offers information on Heckler and Koch firearms, a message board, and gun rights data.
   http://www.hk91.com/

HKPro.com
   Features this unofficial resource for the serious student of Heckler and Koch. Provides a forum and also sells HKPro gear.
   http://www.hkpro.com/

Heckler and Koch USA, Inc.
   Features this North American subsidiary which also distributes Fabarms.
   http://www.hecklerkoch-usa.com/

Mark23 Owners Guild
   Presents a library of information on everything for owners and enthusiasts of the Mark23 or Mk23mod0 SOCOM.
   http://www.mark23.com/