In order to prime the blaster, you simply pull your hand on the handle back towards your shoulder like so:
And then return it to the forward position with the aid of a strap keeping the back end of the blaster tight to your shoulder (I've been using a cheap belt that I never wear. I hope to set up something with a simple buckle that I can snap on quickly):
And the blaster is primed. The catch is an upgraded Rainbow catch discussed here. The handle is secured to 2" Polyester, which fits over the 1 1/4" PVC and under the 2" PVC, which has been cut to allow the handle to slide through it, but keeps all other moving parts contained, the sliding ring attached to the handle included). The whole blaster is almost exactly the length of the Rainbowpump, but being that the handle, at rest, sits about three inches farther forward, most of the weight/length is kept to the back end, which, being secured to your shoulder, makes the blaster as a whole quite comfortable to operate (with one hand). You can use it with two hands as well, of course, which also works real nice. I'm super duper happy with the way this turned out. It works real smooth, and shoots real hard. I did take down the volume a bit from a standard Rainbow draw, to keep the size reasonable, and it still shoots super nice. There were also quite a bit of new things I did to this blaster, but I will, of course, be doing a full writeup, being that this will be one of my contest submissions for ryan's homemade contest, so I will discuss them then at length. But for now, what do you guys think?
EDIT: Also, this would, in theory, be entirely operable with one hand. However, in order to make it really work smoothly, you'd need a low torque ball valve, or some sort of dart door on the end of the hopper. Otherwise you'll need the assistance of the other hand to open the hopper and to load darts. I don't want to call it entirely one hand operable, just because people may have limited access to either of these things...or may just like end caps.
Edited by diamondbacknf1626, 15 May 2011 - 01:51 PM.