Some comments about ammunition...
When I got my first one, about the only ammunition to be had was CIL Dominion 160gr round nose. Worked fine. My handloads worked fine as well. The rear sight can be arranged for either the old 160gr round nose or the later 139gr pointed bullet.
Keep in mind that the gas system has no adjustment, and there is essentially no primary extraction. When the gas impacts the bolt carrier, the carrier is going to blow backwards, and the bolt will unlock. If residual chamber pressure is too high, the extractor will rip through the rim, leaving the case in the chamber. Lock the bolt open, tip the rifle vertical, the case falls out. The spare parts kit that came with the rifle had spare extractors.
Eventually the excellent Swedish ammunition in the brown boxes appeared. This is when the ripped rims really started appearing. Apparently the Swedish manual suggested lubricating the cartridges, to insure functioning. Ejection was vigorous.
So, be aware that the ammunition you use has to be compatible with the rifle.
When the Swedes started selling off rifles surplus to their needs, the little Mauser carbines went first, then the AG42Bs. The 38s and 96s were last.
I suspect that the semi autos went before the Mausers because they were never entirely satisfactory, the design being inherently ammunition sensitive.
Some shooters have found a solution by modifying the gas system to make it adjustable, so it can be tuned to the ammunition, rather than tuning the ammunition to the rifle.