I had one and just sold it. It ran fine but had a heavy trigger pull. It did have some FTF's,but I chalked that up as much to the crappy Ecuadoran ammo I bought from TNW as to the gun. Most failure to feed problems came from the initial loading of the gun. If you insert a belt and charge the bolt, it feeds only about half the time. If you insert a round into the chamber, close the bolt, then insert the belt, it fires and feeds almost all of the time. The gun was fun to shoot but a PIA to clean. I sold it because I got a registered MG34. MG4's can be very finnicky guns and belts make a lot of difference. It also helps to spray the belts with dry lube before loading. Did I mention the Ecuadoran ammo TNW sells sucks? The only problem I had with the gun was a bolt roller that came off. I sent it to TNW and they fixed and returned it right away. The fit and finish of the gun was very good.