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

Heckler and Koch MP5 with JAC Sear 3 pos pictogram with B&T Side Folding Stock.  This is a registered sear by JAC.  You could move the trigger pack over to any numbers of hosts...

Heckler and Koch MP5SD 9mm This is a 3 pin Registered Receiver(As close to factory gun as possible) 4 Position / 3rd Burst Lower Gun has been completely gone through and redone by RDTS A3 Stock

Heckler and Koch MP5(SP89) 9mm Side Folding Stock Front K Grip Plastic SEF Lower Sear Ready  

Heckler and Koch MP5A3 9mm Factory Machine Gun (Not a conversion) MFG in 1981.  You can replace any parts with factory parts(You don't need to CLIP and Pin anything, time hammers, or weld...