I bought a couple of these side charging complete uppers with 16" barrels. They ship with a BCG that has a non-standard bolt carrier, cuz it has a handle sticking out the side of it.
Find the AR15 upper that fits your needs. With a wide selection to choose from you can find the AR-15 complete upper to start your next build. Shop today and save! - 5.56 NATO - Right Side Charging
www.bearcreekarsenal.com
They seem to be out of the 16" upper now though, they were $340 complete with BCG when they were in stock.
I got some snobby remarks when I posted about these earlier, some people seem to consider these as bush league quality, I dunno but I like the upper because it's very lightweight, it works, I'm not an 'operator' , all I want to do is hit a plate at 100 yards, and I dislike the standard AR 15 charging handle when I have a scope.