If you buy a Clint Beyer 16", M4 Profile Barrel and build from that with a CMMG Bolt,
There is no better, more accurate upper to be had at the present time. Mine is the
most accurate combination I've ever fired... Clint's Barrel runs just under $300.00 +
shipping. It is Aluminum with a Steel Liner and is Awesome..... CMMG may be able
to set you up with the whole upper or you can buy the barrel direct from Clint and go
PS: All the attention is on Shot Show for a while... If you have more questions, PM me
and I'll do my best to help....