First things first: the stock internals (pic taken AFTER partial disassembly and cutting).
The plunger has massive draw, and looks impressive. At least until you open it up and realize the entire thing is hollow. There is no actual plunger head; this operates purely by moving a massive amount or air. In essence, it's a giant, crappy reverse plunger. That needs replacement.
Here is the solution! That plunger tube happens to be 1" in diameter, although the walls are a bit thick. Easiest thing is dropping in 1" PETG for the new PT. I kept the green base from the old plunger, and stuffed/glued in place a 3/4" to 1/2" CPVC bushing at the front. Notice that I moved the green piece forward, just in front of the screw well. In it's original place are two pieces of polycarbonate! These will act as the spring rest.
As for the original catch, the inside circle measures roughly 9/16". Due to lack of materials, I grabbed a 9.5: length of 1/2" wooden dowel rod, and pieces of brass to fill the gap. I retained the original pin and used it to secure everything. PLEASE NOTE THAT YOU SHOULD USE SOME KIND OF PLASTIC ROD. That will last a lot longer.
Here is the whole plunger assembly. I used a fairly large Wood screw to secure the NF plunger head, and doubled up on the o-rings. You see 3 Buzz Bee Double Shot/Tek 6/EVERYTHING springs. Fairly weak, but as this is a prototype, I wanted to keep as much of the original draw as possible. If you're going to add stronger springs, you should probably put some metal brackets in the shell for reinforcement - the plastic slot the polycarb sits in would not last.
Put everything in the shell, secure the PT/center it, and close up! You still look stock, but the new internals allow you to make this a beast, with proper reinforcement. Adding a [k26], or 2 Ace #49s will be the next step.
Please note that you'll need to change up the length of your plunger rod compared to this writeup. If you want a longer or shorter plunger tube, if your spring(s) are different sizes, etc. Measure twice, cut once!
Ranges? Only decent, hitting about 60' with slugs. Mainly, this is lust due to the weak spring combo. That will soon be rectified
Edited by Buffdaddy, 19 June 2012 - 09:50 AM.