Eleven11punk

So I finally did it. It wasn't as clean as your pics since my bits kept trying to spin the tiny pieces of poly and I had to use a Dremel instead a band saw. I ended up using my Dremel a lot for cutting and grinding but it worked out well enough. The mounted seal looked good and worked with a little grease. I also cut out the little xman symbols at the back of the orange barrels.
However there was no noticable difference for me in range..haha oh well. I may mess with it some more; try to get a better seal where the white tube meets the barrels. It was fun for my first nerf mod. If I ever do the barrel extension I'll be sure to post it in mods section. Thanks again!

You don't put any on the back. You put one in the middle that matches the ID of the skirt seal (7/8") so it stays put, and you put one on the front that's just large enough (1 1/4") to hold the skirt on.

Did you use a hole saw to cut the poly? I was planning on using one but not sure if the center drill bit part would be larger than the 9/64 hole you said to drill for the screw.

Thanks snakerbot. I ordered the skirt and the polycarbonate. I'm thinking of trying thin walled pvc and buying longer springs for the second part of my ridiculous mod instead of cutting up another ballzooka.

The only mod writeup I've ever seen for that blaster is the one I did. I'm not sure it's a great mod, but it exists.
 
To answer your questions, it's a manual plunger blaster, sometimes called  "push-pull" blaster, for obvious reasons. Lately I've seen this style of blaster called HAMPs, after Kane's blaster of that name. I'm not sure about extending the inline clips. I've never seen it done.

Hey so I ordered the rubber seal but reading over your instructions for the polycarbonate I'm a little confused.

Are there two pieces I should cut? (One for front and back?)

Click "Image Archive" at the top right. They were a victim of the imageshack apocalypse a few years ago, but survive in that archive.

Great! I couldn't see it because I wasn't on fullsite mode. Okay so now I just need to find another cheap, available ballzooka. A broken one I can part out.