Had mine in 6.5CM with the precision stock and 24" barrel for a couple of months now, no feeding issues whatsoever with the 5 or 10 round magazine. Nor am I experiencing a rattle from the mag, in fact its a fairly tight fit in the mag well. Perhaps there is a bad batch of mags out there.
Love the QD sling attachment points, so much easier to remove a wet sling now, and a short picatinny rail under the forend means I can install a QD picatinny bipod in seconds that's a much more secure fit than my Harris type bipods, and less fiddly.
The forend is a little tight and requires a certain technique to remove, however I was probably being a little too careful with it (YouTube helps if unsure).
Splashed out on the dedicated S20 scope rings/rail with 20MOA cant, lightweight but very secure, perfect machining and anodising, I say 'splashed out' but was cheaper than something like a Tier One or Spuhr mount - and way lighter.
Overall a well thought out system that's very well put together. Just waiting for the .300WinMag version to land in the UK, shame they don't make it in 338LapMag.