Heckler and Koch HK 69A1 40MM This a presample 40mm grenade launcher imported by Heckler and Koch.  This can be retained by an FFL with their SOT even after they give up their license...

Heckler and Koch MP5A3 9mm MLOK Forend Surefire Flashlight Qualified Sear 4 Position Pack / 3rd Burst Lower GSL Fatman Host is an SBR

Heckler and Koch MP5 with JAC Sear 3 pos pictogram, Vortex Strikefire optic, A2 stock.  This is a registered sear by JAC.  You could move the trigger pack over to any numbers of hosts...

Heckler and Koch MP5A3 9mm 4 Position 3rd Burst Lower A3 Stock Desirable Fleming Sear M-Lok Forend Surefire Flashlight GSL Phoenix Silencer  

MP5A3 with 3 Pin Swing Down Lower Heckler and Koch This firearm is a 3-pin swing down registered receiver model, closely resembling an authentic factory HK design. It is compatible with all...