Hi, I am new to the sight - enjoying the knowledge base for sure. I know that Faxon is active on this sight as well, and would like their help with an issue. I recently built 2 identical AR's using identical Faxon 18" match barrels and Faxon BCG's. One of the weapons chews up brass with both ejector and extractor. Swapping out BCG's swaps the problem to the other weapon. Both weapons shoot and cycle just fine. I have sent the problem BCG to Faxon as they requested, but am having difficulty getting a response back. FYI, headspacing on both weapons is fine. Testing the weapons with a Brownells BCG, Aero Precision BCG, and Bravo Compamy BCG has exhibited nothing in relation to brass damage whatsoever - they all shoot and cycle fine as well with those BCG's. I really just want to enjoy shooting these weapons with my wife. Comments are appreciated! Thanks!