Heckler and Koch MP5K-N 9mm Host was superbly MFG by Bahnhof Machine Qualified Sear in a 4 Position / 3rd Burst Group B&T Collapsible Stock Correctly Re-marked  Paddle Mag 3 Lug Threaded 1/2 x 28  

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 Mp5K-SD Build on an SP89 originally Fleming Sear in a 4 Position Burst Pack 9mm K Silencer by KC LLC

Heckler and Koch MP5 with JAC Sear 3 pos pictogram with A2 Stock.  This is a registered sear by JAC.  You could move the trigger pack over to any other 9mm host with the timed bolt.   ***ON HOLD...

Heckler and Koch  MP5 A3 9mm S&H Sear professionally installed in a New 4 Position 3 rd burst group 3 Lug and threaded barrel with knurled thread protector Vented Forearm