So, a Trijicon is just a HiViz with more f.o. pickup! Live and learn... I could just see a half dollar sized CR-2032 needed... you know the Lithium cell - the one WallyWorld is always out of - and dies when the red dot is left on overnite. Seriously, I have bad history with them... and then there is the parallax problem with reflex sights - always a problem with my prebsbyopic eyes. The 'scope, with it's eyepiece dioptic adjustment, compensates for that. Then I found that low strength reading glass diopter (+1.00 to +1.25) full lens safety glasses were my key to iron sight use again - nirvana!
Like I said, my 'scope rides atop that rail maybe once a year - in the fall - as I ponder it's use in hunting white tail - but I just don't buy a license. I prefer the simplicity/dependability of iron sights, admittedl, many of my S&W's sporting the HiViz f.o. front sights.
I agree re the 329 being a beast with real Magnums. The padded backstrap provided by the .500 Magnum Hogue monogrips, a la my 6" 629 in the above picture, would help with the briskness of the recoil, but do little to keep the muzzle down, other than a tad higher grip. Still, they are a Godsend with the 629's and real Magnums - well worth the $38 + s/h from S&W Accessories.
Stainz