I have a Bushy upper that I picked up back around 2003. It's a Dissipator style, with a 1/9 chrome-lined bore. It was originally a flat-top upper, but I've modified it along the way.

Originally (but with A2 handguards)
[Linked Image from i.imgur.com]

First revision,
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Current, and final configuration,
[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]