AR Sponsor
Posted: 4/13/2011 5:46:51 PM EDT
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I am looking to build a Mark 12 Mod 1 I have bought a new KAC lower and I am starting to piece together an upper my question is how bad would it be if I went with a Larue upper or similar if I can't find the correct rail.
Here is a picture of the lower I found. 
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AR Sponsor
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