The new pump was originally designed to rotate a cog, however until recently, a cog with the right diameter to fit in with the teeth of the pump had been eluding me, and so this rifle works with the pump in direct contact with the hammer. I intend to continue work on a v.3 that will utilize a traditional pump as opposed to a handle pump, and my hopes are that in doing so I will be able to make the gun more compact and more efficient.
The difference between the v.1 and the v.2 is merely the hammer, but a large part of the gun had to be altered as well to accommodate the hammer. The original hammer extended a mere 3cm from its axis of rotation, limiting the distance it had to accelerate. This hammer also had the design flaw of being at an angle, directing a lot of its force down rather than straight into the projectile. The new hammer extends 6cm from the axis of rotation, doubling the distance it has to accelerate, and also contacts the projectile straight-on, ensuring that all of its force is being transferred to the projectile.
So, back to English. I've put a lot of effort into this project over the past week or so and I feel that this is a very high performance gun. Although the mechanism has still not been used to its full potential, it is definitely a post-worthy gun and instructions are on their way.
*UPDATE* Instructions for this gun can be found here:
Without any further ado, say hello to the K-2 v.2: