It has a turret, why the hell not add rearloading to the thing?
Take apart you Firefly, unscrew everything like normal. There's a mod directory; you should be able to figure everything out.
I used 1/2" CPVC, in 3 5/8" lengths. I don't plan on using stock darts in this thing, so I may as well make the barrels as long as possible without interfering with the orange piece in the front. Secured with epoxy - I have a ton of the stuff, so let's be permanent.

Turn that turret around when it's cured, and carve out the rear for your darts.

Now for your shell: I went for the right side, since there's room for two slots. On the other shell half, there's only room for one, so I decided against it.

To the plunger tube: made a new seal by putting craft foam around the spring-loaded stock seal. Pretty simple, works for my purposes. Although I could do slightly better.

Finally, put the shell back together, get two half-sections of PVC, and shave/glue like so. I still need to slice a bit off the pipes, to make it easier to load (notice the plastic jutting out where the halves are uneven).

And that's it. I still need to add another spring; I hink a slightly cut down NF spring might be able to fit in there, but I'm open for suggestions.

Ranges are the average 45-55, but I only have slingshot darts on me, and Fireflys don't have the power for those stock.

EDIT: You can nest LSFG spring underneath the Firefly spring! That has been done.
Edited by Buffdaddy, 07 February 2011 - 07:05 AM.