How is the fit of magazines in this gun? I’ve been doing a bunch of research and in a few places some reviews say the mag wobble is pretty severe. Anyone experiencing this???

No wobble here, I have been using only Glock Factory mags.

So tight that some gen mags won’t fit.

No issues with mine with Glock factory or Magpul mags.  I never tried the Ruger mag.

I was concerned about this too, but I'm now convinced it's more of a cosmetic issue, similar to mag wobble with AKs. In order to test this I loaded mine up with cheap Wolf 115gr ball, then held the magazine with pressure on all different sides while rapid firing. Despite trying to force it to malfunction, it chewed through all the rounds no problem. Mine's been very reliable in general though, with the exception of one old and worn G26 mag, which failed to hold the bolt to the rear, once. The feed-ramps on it are massive, both top and bottom, the chamber area looks comparable to a modern handgun, which I'm sure helps some. I haven't noticed any copper build up on them though, which would indicate rough feeding. The action is also very smooth, almost as smooth as a worn in SAM7, certainly smoother than any ARs I've owned (though this is probably the rotating bolt, more than anything).

I only really have two minor complaints with the rifle. I wish it could be field stripped without tools. I'm also not too fond of the ghost ring rear sight, I'm just slower with it compared to a peep or patridge style sight (Aimpoint fixed that though).

So in short, some wobble, but it seems to be a non-issue.

Glock mags have a little wobble. ETS mags are tighter and wobble less but take more force to insert.

All seem to function fine.

Same - Glock and Magpul nice and no wobble.

No issues when OEM or Magpul mags, they have very little wobble and drop free. The only mags I have that don’t drop free are my three 33 rounders.

Mine has a little wobble with factory Glock and Magpul mags.  Doesn't bother me at all and has been 100% reliable.  ETS mags are almost a no-go they're so tight.

I'm using Ruger 17 round SR9 mags as well as a Magpul 32 rd.

Little wobble and functional, however the mags from the original Ruger PC carbine were from another pistol (type 95 something), and do NOT work in the new carbine. Confusing, but there it is.

edit 9/17...the 32 round mag is a Promag, not Magpul.   Shooting this weekend,  the Promag seemed to cause  a FTE every other fill-up.  The Ruger sr9 mags functioned flawlessly.

I'm gonna take the Promag apart and clean, deburr and dri-lube it and report back.

Yes, the original PC Carbine used the Ruger P89 mags.  I ended up selling the P89 decocker years ago since I was not shooting it and then sold my original PC Carbine to fund the new PC carbine.