Night Finder to Airsoft

My friend and I were bored one day, so we decided to make a detachable, sturdy air soft Nerf thing...
SOO... here's what ya need...
-One Nerf Night finder (preferably modded, I added a BB gun spring)
- 2 pins (at least one)
- 2 Rubber Bands
- Scotch Tape
- Air soft BB's
- A Nerf dart (can be a Stefan or old dart)
- Scissors
- Drill (small bit)
- Yellow or longer knex piece (or something you could use as a ramrod)
- TARGET (preferably human, heh heh heh >=D)

This is the harder version, receiver 545 made an easy one

Btw this is my first instructable... and the dates on the pictures are wrong, i made this November 2009.

Drill straight through little exposed barrel between blue (or yellow, if you just bought it) parts.

Cut off end of nerf dart. Tape around the end.

Insert Nerf tube into barrel. It only works from here on if you take the air restrictors out. Insert taped side in first.

Stick needles through the hole and the taped Nerf foam, and out the other hole. Do the other needle on the opposite side.

Stick bb inside the tube. Push it down with knex piece (ramrod). If done right it should stop at the needles. Sorry the picture is the same as step 3. Apparently you can't change the labels.

Put rubber bands on end. Pull back and fire. <Warning always use eye protection when playing with airsoft.> Now you're done! =D. You can remove this attachment whenever you want.

Fps Ratings-
Test 1- 143.07
Test 2- 141.14
Test 3- 135.35
Test 4- 137.93
Test 5- 236.63 ?
   Average= 158.83