Not sure how you can eliminate the recoil. Any time you have an action, there will be an opposite reaction. When the trigger is pulled and the ram is released, there will be an opposite reaction and when the ram stops in the bottom of the cylinder, again there will be an opposite reaction, just as in any spring gun. It's just exchanging a ram for a spring and not using a spring.
Also, roughly how much are we talking in costs for these rams???