I've owned exactly one 2" 12ga. It was French, and it's the only French 2 incher I've ever seen. Just to scratch a very minor inch. Very light, couldn't hit squat with it, and I had no intention of reloading for it.

McIntosh breathed a bit of life into the 2", after which the Spanish made a few. But those Spanish 2 inchers weigh what a light Brit 2 1/2" 12 weighs: 6# neighborhood. The Brit 2 inchers are down in the 5 1/2# range or less