Thanks to this mechanism, you can not only load more darts, but also reload them faster.
To get a better idea, watch the video:
Thanks to Instructables member ballisticjoe I found out, that I'm not the first one, to attempt this mod. You can find an other version, of this gun here.
Step 1: What you need
• three NERF Mavericks (e.g. on amazon.com)
• fine grid sanding paper
• two M4 screws, 4 nuts (two locknuts are even better) and two washers
• self tapping screw
• strong glue
• 6 mm acrylic, or plywood and a way to cut them to the shape shown in step three (e.g. laser cutter,
scroll saw, fretsaw...)
• optional: email paint, paint brushes, epoxy putty
• hack saw
• cross slot screwdriver
• claw hammer (if you don't have one, don't worry a slotted screwdriver will work as well)
• drill bits: 2 mm, 4.2 mm
Step 2: Take them apart
Carefully pull the two big yellow plastic pieces apart. Take the barrel out and carefully use a claw hammer to pry out the metal rod. Be careful, not to loose the spring. Remove the three screws in the back (black part) of the barrel and gently slide the top of the barrel of.
Take the air restrictors out and remove the inside and the springs, you wont need them anymore. I've seen people cutting of the spikes off, tried it myself and didn't really notice a difference (so you are free to do it, but don't expect any wonders).
Remove the two screws in the middle, to get rid of the grey piece in the back. Do this for all three guns.
Step 3: Cut the connectors
I cut the pieces out of clear acrylic (5.8 mm), but plywood should work as well.
UPDATE: I've been asked by quite a few people, to send them the vector files, that's why I've uploaded them here.
Step 4: Make room for the barrels
The fourth picture shows, where you will have to carefully cut the grey pieces, that hold the front barrel in place. Make very sure, not to remove all of the inside, as shown in the fifth picture.
Step 5: Stabilizing
To give the gun a smooth finish, I used the Milliput to fill the holes, as shown in the pictures.
Mark the middle holes of the connector pieces, by holding them in place with one barrel attached to them. Due to the lack of an angle drill, I drilled the holes, with an 4.2 mm drill by hand (after drilling a smaller hole at an angle).
Step 6: Assembling
To stabilize the plastic, glue one washer to the back of each hole, as shown in the first picture. Then secure the connector pieces with a screw and two nuts each.
Reassemble the gun, if you are having trouble on finding the correct spot for every piece, check out the picture in step 2. If you would like to make your gun stronger, add two or three washers at the back of the spring.
Once, you are done, you will have to reassemble the barrel. Instead of using the small grey front piece, use the front connector piece, as shown in the third picture. Don't forget the spring and hammer the metal rod back into the barrel. Once you finished one barrel, turn the mechanism and attach the next one.