I'm wanting a lighter weight, very durable upper. Historically, I've used 18" SPR barrels from White Oak. I love the accuracy. Every one (of about 10) has yielded 1/4 moa or so. They are heavy and don't seem to be very long lived.

I care less about accuracy for this application and more about light weight and long life. I'm thinking a 16" barrel with weight similar to an M4 profiled barrel. I'm not picky about how it's made or how the rifling is cut. I could live with 1 - 1 1/2 moa accuracy and would like the longest life possible.

I've never given this a thought before and have absolutely no experience with anything but precision type barrels. Point me in the right direction. Cost is not a factor.