My 4506 is a Fresno County Sheriff trade in. I would be happy to buy another 4506 in good shape. They are great 45 ACP handguns.
It's been more than 10 years, so I'm not sure if I'm remembering the agency, but when I was talking with the factory about a potential guide rod issue in a couple of our 4566TSW's, they mentioned that they'd had to replace some 4506 guide rods for a CA SO, and I thought it was Fresno CO SO. Their issue supposedly had to do with some rods apparently not having been heat treated properly, and over time and shooting the front ends of the affected rods deformed into a "mushroom" shape. This mushroom deformation caused a problem with the rod ends fitting and moving in the opening of the slide's spring box hole during functioning. Duh. The only time I'd ever heard of that happening was with a major aftermarket manufacturer & vendor who marketed non-factory steel guide rods (the manufacturer told me about it).
Our problem was different and simpler. We had some of the aluminum guide rods in our 4566TSW's, and apparently the guy operating the press that staked the heads/collars to the guide rods (the older 2-piece design rods) had gotten a bit exuberant in his staking, causing some very, very small cracks to appear in and around the staking dimples.
The good news was twofold.
First, it only happened with a very few of the guns I saw, and S&W they immediately replaced the rods.
Second, they called back a while later and said the engineers had closely examined the effects of deeply staking the aluminum so fractures appeared in the staking dimples, and they'd found it only created surface micro-fractures (but big enough to see with a magnifying glass) which didn't compromise the security of the staking inside the rod bodies. It just looked gnarly (no, he didn't use that word

).
That second bit of good news was good news, indeed ... because of the extra replacement guide rods they'd sent me, a couple of them
also had the itty bitty fracture cracks in the staking.
Some days you've just gotta roll with what the universe lobs at you.
Naturally, if the guide rod in
your 4506 is the new style 1-piece steel assembly (with removable plunger and spring), none of this applies because there's no staking.
