Had both the MS700 and later stupidly, when I could afford it the Ares MS338, externals were fantastic, the internals were dogshit. Main trigger sear in both examples snapped into pieces within 20 shots a piece, requiring extremely expensive aftermarket options just to do the bare minimum.
Amoeba Honey Badger, that the stock ETU caught fire on its first use, and turned the gun into a lovely pile of beige plastic gloop. Round 2, when a local tech pulled the warranty replacement apart to remove the problematic ETU before plugging anything into it, discovered that the sector gear and bevel gear were made of clear plastic, on a £250 'premium' gun back in 2014.
G36, which for some reason only known to the intelligent people at Ares, was shipped out with an M170 spring, resulting in a gearbox shell that was cracked at the front of the cylinder, such that when the gearbox was removed the front of the shell clean fell off.
M320 GLM, where the primary receiver lugs for the hinge clean snapped off after 50 odd shells being reloaded.
Tavor 21, first generation, plastic gears in a £370 gun.
I have a much longer list, but that is why there is hate for Ares. They're like VFC AEG's, briliant externals (most of the time) but internals which need to be, most of the time, completely replaced OOTB.