All models (94, 94C, KA MKII/III, 98 DAC), except for the 98DA and the 95 (which is a revolver
) take the standard HiPower mags. The 98 DA uses a build for the model 15 rnd. magazine.
The quality/price ratio of those guns is hard to beat. The SA Arcuses share most of the parts with the HiPower. I successfully installed a HiPower SFS kit (with minor altering in the frame) and HiPower trigger - was drop in installation.
The 94 and 98 are using a lighter recoil spring compared to the HiPower - 15 vs. 17lb. This is possible because of the bit heavier slide. The compact versions - 98DAC and 94C are using 17lb. recoil spring.
Just like HiPower these guns are extremely reliable. Possible faults can be expected due worn-out extractor (FTE, Double Feed) and recoil (FTF, compromised accuracy) springs. All Arcuses are +P rated.
Just like said above the Arcuses are not the most handsome children in the HiPower family. The rather are the bullies of the bunch. The finish is ok...ish and if you're buying second-hand gun it will show signs of wear where it touched the holster.
The DA trigger pull of the 98DA/98DAC is quite heavy. On the other side, the SA after the first shot is a dream. The SA of the 94 is better (for me) than the one in the HiPower. There's much less grittiness compared to the BHP when the mag.disconnect is in place.
To the Arcus family you can also add the Kareen MKII/III. They are manufactured in the same facility and have some differences in the exterior - additional serrations in the front part of the slide, different trigger guard and always presenting beaver tail (the early Arcuses don't have beaver tail at all) and better finish.
Finding a holster made for those guns is mission impossible. The holsters for HiPower work fine, the ones for CZ 75 and CZ 75B also.
Here's a hint for Arcus users - if the serial number of your gun was not changed during the import, I might be able to tell you the month and year of manufacture
This is my EDC Arcus 94 with some modifications :
Polished and hot-blued slide and frame
Polished and cold-blued internals
Gold-plated Browning trigger
BHSS Springs except for the sear spring
SFS
Stabilzed Wood grips
Rhodium plated: Mag release, extractor, mag plate
Shots excellent, trigger pull in the ~5lb. range