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AR15.COM
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5/16/2011 7:20:13 AM EDT
I know there is a TON of info on the forum, and I have learned way more than I ever thought I needed to.  Some of the topics are a little older, and I want to make sure there aren't any major changes. I do want something mil-spec or better in NATO 5.56, and in an M4 style, so I guess 16" (or 14.5" with a compensator)

I am debating between buying a Colt LE6940 and swapping parts I want, or just building one:

Lower: Forged LMT or Billet
Upper: LMT or Billet
Barrel: MilSpec 1:7 6150
BCG: Still don't know, maybe LMT enhanced BCG
Buffer Tube: MilSpec
Stock: Magpul UBR
Trigger: RRA 2 Stage or CMC 2 Stage
Grip: Magpul MIAD

I could use help deciding between Forged or Billet, and what BCG and barrel to use. How hard is it to convert from gas tube to piston (trying to decide if I should go piston from the get go). Also, is there any brand I should stay away from for certain parts?

This rifle is just for fun.  Not going to compete or anything, but I do not buy crap, ever. I would rather fork over the coin now, and have equipment that outlives me. Any insight would be greatly appreciated.
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