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Old December 9, 2009, 12:42 PM   #4
NSO_w/_SIG
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Join Date: December 4, 2004
Posts: 553
As long as everything is in spec you should not have issues mixing and matching brands. As far as buying the upper reciever and barrel seperatley and installing the gas tube goes, none of it is exceptionally hard but you do want to make sure you have the right tools and a vise block before you attempt it. The last thing you want to do is damage the components of the rifle.

As far has head spacing goes, again as long as everything is in spec and starting out with a new bolt operating in a new chamber everything should be good to go.
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