i looked at mine and it was flared quite well on both sides. I ended up getting a spare gas tube from somewhere (Milarm?) and when I came to work on that one I ended up destroying the handguard. No biggie since I had a fiberglass one I was going to install, but they definately are a pain to get off.
The Milarm handguard was already somewhat toast when I got it, I specifically ordered a gas tube and the rear retainer, and I suppose they found it would be faster just to send me a complete tube with a damaged wood handguard...oh well.