To install this spring spacer, open up the blaster and remove the spring/plunger guide peg. Slide the spacer over the peg, replace peg into blaster, then close up the blaster.
Closing the blaster may be a pain as the parts have a tendency to try and splay open, but it can be done.
The .5in spring spacer should yield between 140 and 145 fps, and I haven't tested the .25, but you can probably expect somewhere between stock and 145fps.
You may be able to stack the two spring spacer and achieve even higher, but I wasn't able to get the blaster to close.
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