My family of HK clones, BRN (416N), PTR (G3), POF (MP5)
Michael's Machines MM5. Have fired over 1,000 rounds without a single malfunction. Added a binary trigger, which is a gimmick in my opinion. It was fun to shoot, however you will go through ammo quicker. The selector levers are far too easy to move between safe, fire, and binary. The binary trigger will be removed and set aside for use as a novelty.
My new favorite:
Dakota Tactical 10mm