Stick are you going to be loaning this out and letting people put massive amounts of rounds through it etc. or are you going to be dropping it running it over etc. ? Since I didn't get a response any chance that you'd be willing to run a redi mag system on it to see how it holds up to abuse? Also my vote if you're putting massive rounds through it for barrel would be Noveske N4 chrome lined and any billet lower that has an integrated trigger guard.