STI matched upper/lower

I've got one too and it's a great piece for the price. I'm pissed that you're out of stock now... I was going to get another one last week just to have it available for my next build. I should know better than to wait on things like this these days.
 
This thread is relevant, so I'll bump it rather than starting a new one.

I am also interested in using the STI matched upper/lower receiver set as a base for an AR build, and the barrel I plan on using has M4 feed ramps in the barrel extension.

My question is: does the STI upper receiver have grooves cut into it to mate up with the M4 feed ramps in the barrel extension?

Freedom Ventures, or 90yjgimp, or anyone else with the receiver, please enlighten me.
 
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