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Posted: 3/27/2012 7:39:57 PM EDT
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I recently bought a BCM SS 410 16 inch mid upper and I want to change the barrel on it. I want to save the stainless for when I'm more experienced with shooting in general. I know I want a 1:7 twist and I want it chrome lined. What else do I need to pay attention to when purchasing a barrel for my upper? I don't want to order the wrong barrel. Also, what's a gov profile or bull barrel? How many types are there? Thanks for the help.
This is my a stock pic of my upper from BCM site 
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