TrinityCustom...
I've noticed a few such writeups from you, and I'm just a n00b to this forum... Great idea.

I've done almost the same thing, except that I purchased an $8 shotgun cleaning kit from KMart, and used the sturdy aluminum rod to hold the cloth...

Also, I used MAAS, and all I did was polish the anodizing on the inside... It's not down to the aluminum, but my demon paintballs on hand already have a good 2mm of space on the top end of the barrel... poor matching.

Since at this point I really don't want to increase my bore size by even .005 inches, I'm not really willing to cut down much more.

Still, the effects of a self-polished barrel are tremendous. The shots seem to be a bit more accurate, and I believe the loss of friction has helped my range out a bit. At any rate, I've got a smoother setup now than I used to.

Additionally, your mod is what I refer to as "ghetto", not meaning low grade or worthless, but capable of being done on serious budget constraints. I like anything I can do with low cost materials on hand or low cost materials which are easily available.
(I can't figure out how to mod my trigger for a mechanical 10-15 bps yet, but I'm still thinking)

I've already dumped $150 on my weapon, and another 20 in oil/grease/squeegee... so justifying any more than $30 for another upgrade will meet with disapproval from the wife... we're saving for a vacation, so any real purchases detract from that.
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To anyone else out there,
DO THIS MOD! I can recommend MAAS because it seems that it's little more than Jewler's Rouge with some ammonia to make it into a thinner paste. It has some ultra fine grit, (I can't find out how much yet, but I'm freakin' looking).
The other polishes seem pretty good to, so now you have at least 2 choices.

As an aside, if anyone can find out which has a finer "grit", Mother's or MAAS, I'd be highly interested in that info.