Matt,
Looking at your picture of the 3 blade......does that notch on the backside of the blades sit on the O-Ring? Is that what keeps them closed or do they have some internal system?
When they are shot open does the O-Ring flip down or do the blades simply "bounce" around it?

I do LOVE the idea of a rearward opening 1.5" broadhead.

Blade sharpness good?