Re: .223 Varmint Upper Build advice...
That is correct. That float tube and gas block you won came from a DPMS lo pro and the gasblock ID is .936", just about as bull as you could want in a varmint upper.
I too would go with the .223 rem dedicated upper IF, and thats a big IF, you handload. If your handloading go with the wylde and take advantage of anything thatll fit the chamber.
It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze.
The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do.
Fact of life:
After Monday and Tuesday, even the calendar says WTF!