9mm AR Pistol build issues

    I am just finishing my 9mm AR Pistol build, and I have run into several issues: first was choosing a BCG and upper that were either Colt or Glock compatible; then choosing to use a dedicated 9mm lower, modify one to accept 9mm mags, or modify pmags to feed 9mm! Who has run into compatibility...
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    Recommendations for a self build .308 for hunting on a budget

    Title says it all. I'd like to build my own hunting rifle and am looking for some recommendations on parts and places for good deals. Thanks in advance.