Heckler and Koch MP5A3 9mm Fleming H Sear Registered as an SBR as well Host was done by Ralph at RDTS KAC Front Quad Rail with Aimpont mount and glass Comes with B&T 3 Lug Suppressor  

Heckler and Koch MP5A3 9mm Factory HK MP5A3 MFG 1984.  This gun is a 110% factory gun, not a conversion of any sort.  The Date Code is IE which means it was MFG in 1984.

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 Registered Sear Gun SP5K-PDW 9mm This is a customized Heckler and Koch SP5K PDW with a threaded 3 lug barrel by B&T USA LLC.  This has the new B&T USA LLC collapsible...

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...