Ok, I'm really interested how you drilled the holes in the barrel - in order to keep the finish on the inside of the barrel how did you debur / polish the interior of the barrel after drilling? And just because you say its more accurate than it was - lets be honest, a $20 marker is not going to be very accurate to begin with. Furthermore, I would suspect that with all that porting, you need to run the marker at a higher pressure, which i doubt the seals / bolt etc will like. Not trying to put you down, but running a cheap marker at too high a pressure will increase the wear greatly, alternatively, it will be the same pressure (more likely since I doubt you have a reg) but much more gas, reducing efficiancy. 1/8" is a pretty big hole to be running down the barrel. Anyway, thats just my input.
Tom
Tom