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Now why chrome line the bolt carrier? I have heard this increases wear, but that is just word of mouth via internet. Not sure if it has any real basis.
About tinkering.
How much can you do without voiding your warranty? Does it change depending on manufacturer? Is putting a rail on a rail-less gun going to void the warranty? Or would it require some modding the internal components like replacing the gas key, trigger group, etc. What about other major parts like the barrel, or receivers?
Just trying to get a feel for the big picture. What about mating uppers and lowers? I imagine that can get tricky when it comes to warranty stuff.
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