No it doesn't shoot all at once. You shoot 1 dart, pump the gun, shoot another dart, pump the gun, shoot and so on.
How to make one:
http://nerfhaven.com/mods/ss_rscb/Replace the PETG with you own barrel material and use the smallest size PVC you can find at Bunnings.
Here is how it works:
Picture it as a telescoping barrel, except in reverse: instead of going from a really-tight fit to a somewhat-loose fit, you are going from a really-loose fit to a proper fit.
Let's say you want your barrel material to be CPVC, because it fits your darts "just perfect" The thing to do would be to nest that into some 1/2" PVC, or even some 1/2" thinwall PVC; either way, there is going to be plenty of room between the dart and the PVC.
Make sure, when nesting, that you only put the CPVC a few inches into the PVC. Leave several inches of PVC "un-nested" like so:
_______________________________________
.....................................................-----------------------------
.....................................................-----------------------------
_______________________________________
(where ___ is PVC, ... is nothing, and --- is CPVC)
To load, you put several stefans into the PVC (where the ... are, above). Before firing, you prime your weapon (pump or cock), then shake the barrel down in order to have one dart be pushed slightly into the CPVC.
Even though the dart isn't pushed all the way into the CPVC, it's enough to create a fairly good seal.
When you pull the trigger, the compressed air moves past the darts in the "clip area" (where ... are) and pushes the front-most dart (the one creating a seal) through and out the CPVC barrel.
Before firing again, you'll need to shake the barrel down again in order to make the next dart create a seal.
Then lather, rinse, and continue to repeat.
The upside is that the whole thing is fairly reliable; there's no breech to jam. The downside is that the clip creates deadspace...which decreases range (though not necessarily a ton). That's why people mostly use them on fairly high-powered blasters, like AT2ks or the SNAP series. When you put an inline clip on those, you get a moderately-ranged, high-ROF blaster when compared to their "singled" forms.
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