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How to Make a precision metal tube?

I recently bought a mini metal lathe. I'm making an airsoft gun on it, and i need to make a barrel. The particular gun I'm making is the ppsh-41 (for all of you guys that play cod5, you know what i'm talking about! and for those who don't know, it's pronounced peh-peh-sha), which requires a barrel length of 270mm (found from the blueprints). This is just under a foot, and about the max my lathe can handle (but mind you it can still handle it! ). For an airsoft barrel, the inner diameter should be 6.01mm (as BB's are 6 mm in diameter and you want a tight seal for max accuracy). How can i create a precision barrel like this? My plan for the most part is to take a brass tube with an ID slightly smaller than this, and put it on my metal lathe and then fine tune the inside. The only problem is is that i would need a 1 foot long (or i suppose 6 inch long if I go from both ends, but it might affect the bb where the 2 cuts meet at the center) cutting tool that's less than 5mm (leaving some room for error) in diameter, and won't flex pretty much at all along it's 1 foot length. Or does the flex part not matter because it would flex a consistent amount the whole way? Anyone ever do something like this before?

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lemonie7 years ago
I don't think you really want to try this. For airsoft you could find a tube that would work well enough, for real firearms maybe you would want to cut & rifle your own bores. L
guyfrom7up (author)  lemonie7 years ago
but i wanna try :P
Well little has pointed you in the right direction, but if you're going to do this properly (the hard way) make sure you cut rifled barrels (link may be generally useful)

L
guyfrom7up (author)  lemonie7 years ago
thanks, so i guess i'm looking for a deep drill bit, niiceee
is it a manual lathe? or CNC? i believe you can buy extra long Bore bars for this kind of thing.
guyfrom7up (author)  littlebastard7 years ago
manual