Choc v1 and v2 are different beasts

Similar names, but incompatible stems, pins and sockets. A complete guide to avoid buying the wrong one.

"Kailh Choc v1" and "Kailh Choc v2" differ by a single character, but they are effectively separate systems. Their keycaps, hotswap sockets and PCB footprints are all incompatible. Mixing them up is how you end up with caps that won't sit or switches that won't seat.

1. Different stems

v1 uses a proprietary two-pin stem and only takes matching caps (MBK, CFX, Chocfox, etc.). v2 uses the MX cross stem, so your existing standard MX keycaps fit. That alone splits the two into entirely separate keycap ecosystems.

2. Sockets and footprints differ too

v1 hotswap uses the Kailh Choc socket (PG1350). v2 has a different pin layout and there is no widely stocked dedicated low-profile socket for it — builders typically solder it, or use Mill-Max 3305 receptacles. Assuming "Choc means PG1350" and buying a v2 board on that basis will not work.

3. Which should you pick?

Go v1 if you want the thinnest build or like the dedicated low-profile cap look. Go v2 if you want to reuse MX keycaps or prioritize availability. Either way, check the kit's PCB compatibility list before buying parts.