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Dunno if anyone has seen this yet, but a buddy of mine sent me link to Military Gun supply advertising a 5.7 AR-15 upper that uses PS-90 mags, looks pretty cool. From the description, I'm guessing it's straight blowback. Uses a standard AR lower and ejects downward through the mag well. Check it out:
http://www.militarygunsupply.com/sh...ducts_id=380&zenid=2acvg6sl0ip3hs6ljtdevj7qm6
Gregg
http://www.militarygunsupply.com/sh...ducts_id=380&zenid=2acvg6sl0ip3hs6ljtdevj7qm6
Gregg