I also realized that the plastic tube for my used lip-balm (actually Burt's Bees - not Chap Stick) is also a good tight fit for my micros. Furthermore, the cap fit nicely over a 9/16 brass tube. This means that when the tube is "capped", the barrel extension clicks into place and no more barrel extensions flying/sliding off.


the nice thing is that the yellow tube has a hole in the base that is of narrower diameter (so that the darts cannot be "sucked" backwards towards the plunger - though the tight fit would probably prevent it anyway). Another plus, is that the tube fits perfectly into a 1/2" CPVC coupler. It stays in place even without glue (I did anyway).


This barrel is currently being used on my MaxShot (below) and my ERTL FS1010 (not shown).

Again, no official range testing but I think it suffices to say that it works well. The only thing is that the brass can't be too long (e.g. the full 12") or its weight makes the cap/barrel somewhat crooked.
Nothing revolutionary but just some new fodder for the mod-idea mill.
*Sorry for the virtually non-existent write-up (I'm in a rush) but I think you guys can figure it out from the pics alone.