Stock barrel rifeling(sp)

[NSUCK]

Hey, I just rememberd on my old piranah sts g2 (sold it) the stock barrel had small rifeling marks inside, are they supposed to come like this? none of my frineds guns had anything like it (tippmans/spyders) i just thought that it was kinda odd, how it came that way and i never noticed

[Puddleglum]

I've seen a lot of the Piranha Stocks. I've never seen any rifleing.
Maybe it wasn't clean:|

[NSUCK]

nope, I had just cleaned it when I noticed, I also showed my frined.... it had clear (clear as in i saw it easy) rifeling, the spirals were a little less than an inch apart, and it wasnt a line, it was 2 lines about -- far apart with dashes between them in increments of this far -
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but smaller