^^^^^This^^^^^

I've run CCI Standard through my X Trim Whisper with no problems like the O.P. with the weaker spring. Worked flawlessly, and the moderator reduced the pop considerably. Managed some subs fine too, though you could tell the pistol was on its limit with regards to ammo as the slides recoil became a little sluggish.

You will love the extended mag, I used my two tonight and they ran perfectly.

You got a hell of a birthday present!