I’ve owned two Sport Kings. The first was a later model with a 6” barrel and slide release button. It shot great but had feeding issues. I think this may have been due to the aftermarket magazines more than the gun itself.
The second I still own is a much earlier 1951 model with no slide release button and a 4” barrel. It shoots just as good as the first and no feeding issues. I only have one original magazine and a nice Triple K leather flap holster. I carry it a lot!
For the price you mentioned I would buy it!
You probably right about the mag, which is gonna be the #1 issue with feeding issues in those guns.
DF
I am pretty sure the magazine IS the feeding issue with High Standard pistols. They don't have a feeding ramp and depend on the mag lips to position the top cartridge to enter the chamber as the slide strips it from the top of the stack. I have worked with my dad's Dura Matic with feeding issues. The original mag is an aluminum color and somebody pinched it (stepped on it?) about an inch below the top, so it will hold and feed maybe 3 rounds but binds any rounds below that. It has Hi Standard stamped into the floor plate, by the way. I bought several (Triple K?) aftermarket mags in a batch and somebody directed me to an online site that has correct mag lip width dimensions, so I experimented with one of those mags, using calipers and a small pair of long-nose "ViseGrip" type locking pliers (adjustable with the big screw on one leg of the pliers). Sure enough, those lips measured wider than the specs called for, so I carefully squeezed the top of the mag body and then the lips until they were the correct distances apart. I was able to improve the feeding but not to perfection. One of these days, I may see if I can get an original Hi Standard mag to see if that works any better. I have heard that somebody makes a tool that will expand a magazine body to maybe fix a narrowed mag, but I don't know where to find that tool or someone who has such a tool.
My gun isn't a really valuable item, so not worth spending lots of gunsmithing money on, but it was one of my Dad's guns and in maybe 98% condition. If I can get it sorted, it may be worth passing along to a son/grandson some day.