Help drilling out an AR barrel.

I don't think I'll need an extension. I have some drill bits that are long enough by themselves to go halfway down the barrel, and then halfway from the other end. Anyway the barrel is coming in tomorrow so I will see what needs to be done in detail.
 
Oh fun, looks like the barrel Brownells sent me is chrome lined. I looked online to see how to check chrome or not and i hear that if it's chromed, it will have some silver/gray overspray around the crown of the muzzle. Yep, sound like this is gonna be a fun time :(
 
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