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Lack of AR10 standardization is a bitch. And they are heavy. I guess I just like the idea of the simplicity of non-custom stuff..

At that point, easier to just get an "AR10", surely?

That WSSM bolt is fucken chunky. Non standard upper and/or barrel extension??

http://www.c3junkie.com/m16/762/all.jpg

Not keen, thanks.

Different 6x47, man. 6mm-222 Rem Mag, be very similar to 6mm-204.

I wouldn't use anything with a boltface the size of 6.5 lapua in an AR15 anyway. There are plenty of reports of longevity issues...

You can. But you can't buy a .308 upper for an AR15 - that would be an AR10, and not compatible.

Also you might want to be careful, in theory all uppers should fit on all lowers but cheaper brands...