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Sharing my experiences. I have never owned a piston gun. My DI rifles have all worked very well. I reload my own ammo with the exception of some IMI 262 Mod 1 ammo that I shoot (I can't build a load that shoots as accurately or as fast as this stuff does). I use quality powders in my reloads (H335, Varget, Ramshot Tac). The rifles are also well lubricated with a good synthetic oil (Royal Purple or Mobil 1). I have gone a couple of thousand rounds without breaking down for a good cleaning (it was well lubricated during all of that shooting) and have had no failures to function/see no signs of wear. When I did break it down, the rifle was amazingly clean (wipe down and lube). I still have not cleaned the bore on that rifle and have seen no degradation in accuracy.

I have a Colt, a LMTs and an Aero Precision. They are all 1 in 7 twist. I have no issues getting my 55 grain reloads to shoot very well in those barrels. When I got my first M4 (LMT), I shot some Lake City 55 grain ammo through it and the groups typically ran near 2.5 to 3 inches. I did not know if it was the rifle or the bullet weight. It appears that the issue was with the Lake City ammo as once I started reloading, groups improved considerably. I have not tried any other manufacture's ammo to see how it shoots.