Beats me on striker rattle beside Glock, occasionally Hellcat and some others. Rattle's more typical in smaller CC type striker fired HG's than other more full sizes from what seen and heard. HeckCat here has very faint rattle, may miss it if not listening for closely? Other HG's here do not rattle either. Not even SA's XDM 5.25 here, but that's full size.I checked. None of my strikers rattle. The ammo rattles in the mag on the Q5, but that's it. So "Striker rattle" clearly isn't a thing with XDs, Shields, HKs, or Walthers. Maybe it's just a Glock thing.