I ended up going with a BA 5.5" barrel. All I have left to buy is the BCG, buffer and spring. I have seen decent feedback on Spinta and Kaw Valley BCG's elsewhere. Anyone experience here? I did get to check out a QC10 BCG today but at over $250, I'm having a hard time justifying the price when I don't spend more than $200 on a 5.56 BCG.