For the barrel any Mil Spec 1-7 twist should do you fine.
For the optic I would go with a Aimpoint PRO its a great red dot sight that wont break the bank $400.00. Some will chime in and suggest a Eotech, but for me I love the simplicity of a single red dot nothing wrong with a Eotech I just find there reticles a little busy IMO.
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“The problem with socialism is that you eventually run out of other people's money.”
-Margaret Thatcher-
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