Loosly based off of Kane's concept
Pump action, bullpup, spring powered, Rainbow. Only about 28" long from front to back of the stock, including barrel.
The blaster is primed by a section of 1" PVC linked to the 2" polycarbonate pump grip pushing on a series of telescoping tubes connected to the front of the plunger rod. If I had access to Kane's lathe when I made that part, I probably would have done that instead. The only problem with this is the bolt sticking out of the pump grip. A vertical grip would solve this, but I'd also like the option of a regular pump grip. Any suggestion here would be welcome.
Standard plunger head, with omni-directional plunger rod as seen in the RBP Rev 2. The seal sits in front of where the CPVC elbow is, which is 1 1/2" x 1/2" polyethylene lathed to fit inside 1 1/4" PVC. Can't really see it in the picture, but it's there. Another not so great part of the design is the elbow has to be hot glued into place so it can seal. I'd also like to change this part somehow.
Here is the blaster primed. The handle is made from LDPE, just made it by hand. If you're looking for the plunger head, it's basically inside the tee, right at the end of the PVC.
Compared to a standard RBP. Way shorter.
Overall, I like how it turned out, even though I need to fix a couple things to streamline the design. For those that will ask, it has 6 1/4" of draw (actually wanted 6" but measured wrong somewhere along the way), and shoots as far as any other homemade I've built (range testing is silly).
Questions, comments, and suggestions are welcome.
Here's basically what the finalized version will look like.
Edited by Ryan201821, 12 June 2012 - 04:50 AM.