Me, three years ago:
Modularity means more than just backstraps, it means being able to build my gun, my way. I REALLY like what SIG is doing with the 320, but I’d take it one step further and just sell the serialized trigger group by itself, with no pieces parts in it all, much like an AR-15 lower is sold today.
GhostGuns.com is in the process of developing an 80% FCG that will allow buyers to build their own P320 compatible clones by drilling/milling a few pin holes and trigger sections. The entire process should be achievable with someone with average skills and tools.
So with one of these “80%” trigger packs and a bunch of parts from Apex, Gray Guns, SIG Sauer, etc, you’ll not only have a pistol, you’ll have a pistol that’s built to your specifications and is almost infinitely expandable.