Welcome to the forum, muledeerhunter!
As to the hollow back trigger, it's Metal Injection Molded (MIM), a manufacturing shortcut/costsaver over the older forged/CCH part. The uniformity and strength are there, if not the beauty.
Now, about a current 4" 629... they are fine! Below is my current production 4" 629, SKU #163603, and 6" 629, SKU #163606. They are sporting aftermarket Ahrends cocobolo stocks - rounded non-fg for the 4" and square conversion fg for the 6". Definitely not fun for Magnums. I suggest a set of .500 Magnum monogrips, ~$37 only from S&W Accessories. They pad the backstrap and really help with recoil. Some folks like the OEM open back Hogue rubber monogrips that come standard... I have a drawer full of them!
The 6", like the 4", comes pre-drilled/tapped for a scope rail - simply remove the rear sight (one screw). Below is mine as it was last fall - 2x28mm Weaver H2 atop a Weigand SS rail - and sporting the .500 Magnum grips. They seem to add ~ 5/16" to the trigger reach - which you will gladly accomodate if you like to blast away with Magnums.
I have shot 'real' Magnums in both of mine - the .500 Magnum grips really help. I reload, so my main use for both of my 629s is in the realm of .44 Special loads, whether in .44 Russian, Special, or Magnum cases - thus the usually worn wood grips. Great revolvers! I like them both - but the 4"-er will be my last .44 to leave, that's for sure.
Stainz