It is more possible than you may think, icecreamslick. I think I've got the answer for you in regards to drill bits; they come in very small sizes typically for use in a pin vise.

Just bought an extra set of bits from Tower Hobbies in sizes 61-80, this set in fact: http://www2.towerhobbies.com/cgi-bin...&I=LXFJX5&P=ML

Now these are quite small and the smallest bit is thinner than a straight pin. Now a problem with drilling deep is that the smaller you want the hole, the shorter the bit is. GD Dave, you might have to chop the MG34 into sections or drill from both ends to get the hole to go all the way through.

If you have access to some mold making RTV silicone (even modeling clay would work) and some resin (or some other thermoplastic), you could clone several MG34's to experiment with.

Also, you do not need jacketed (insulated) optical fiber to get really good light transmission or have it flash only at the end (muzzle). The hobby grade fiber, sometimes called mere "light guides" transmits light very well, even better if the light source is from a super-bright LED.

Hope this helps and I too look forward to your progress.

-Harq