I've got a Bushy upper I purchased new in the late 1990's.
It's a nice upper. a Dissipator style. 1/9 twist, chrome lined, carbine gas system.
I've put it through a few different re-makes, trying to find my 'happy place' with it.
Here's a pic fairly stock, I just swapped the handguards for Magpul,
Then I pulled the FSB and floated it. Pic with some 100 yard targets. The 1/9 didn't love the 77gr.
Final iteration, and my favorite. I put the FSB back on, and put it in an A2 upper receiver. Love this.
Under the handguards,
Never any issues with quality.