I can't speak to parts availability, but a great gunsmith fixed the light primer strike issue with my T3X Varmint .223 in 15 minutes.
-----
Yeah, Beretta CS is, um, lacking. I was experiencing light primer strikes and up 10-20% misfire rate with CCI450s in my T3X Varmint .223 (full disclosure: never had a problem with factory ammo, but primer strikes were still light). My LGS from which I purchased it shipped it back for me. Five weeks later, it was back, and the 8th round in was a misfire.
Took it, along with several fired rounds showing the light strikes, to a well-respected gunsmith & friend. I already had the firing pin/spring assembly removed from the bolt. He immediately noticed the shallow primer indentations were relatively wide with almost straight "walls" and the firing pin tip almost cylindrical instead of rounded. So he radiused the tip very slightly to provide a rounded profile without modifying the pin length.
Problem solved. I haven't had a misfire since, in several hundred rounds fired.
Both my T3X Tikkas are/were consistent half-MOA performers (TAC A1 6.5CM sold some time ago to take advantage of a great opportunity on a custom). If I had to choose one factory brand for accuracy and overall performance, it would be Tikka, but I would go to my gunsmith or Mountain Tactical before I'd bother with Beretta service. All my major-brand rifles (Ruger, Tikka, CZ) except the T3X Varmint have been replaced by custom or semi-custom (e.g. Vudoo) platforms, and the MDT-chassis'ed Varmint will be sold when its Defiance-based replacement is finished soon. I have no experience with Bergara or other brands around that price point.