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edited to add: Forrest, what brand handguard do you use? mine is all BM factory stuff.
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Upper handguard is a factory Bushmaster CAR type handguard. I did remove the 'tabs' that is uses to lock into the lower handguard. My lower handguard is a Fobus M33 also with tabs removed.
The Fobus uses a different tab system than the Bushmaster so both of them had to be removed so they would sit flush with each other.
so what do yall think the problem is about why my 552 won't fit over my handguards w/o it sitting at an angle??
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Things I'd check:
1) make sure the handguards are together and there is no gaps.
2) if you can try using another upper handguard (with the lower one removed).
3) make sure the flat side of the handguard is really at 12:00 and not slightly cocked to one side.
It may require some 'play'. First time I tried it, I couldn't get it to work - turns out my handguard was slightly off.