Sorry, G.I. - no can put AR-15 handguards on the AR180B. The bottom handguard is semi-permanently attached(you can take it off, but you have to remove the front sight base in order to do so, and then you gotta re-zero after you replace it), and they just fit in a different manner. Theoretically, I could see a gunsmith welding an AR15 delta-ring retainer bracket onto the 180B, but there's so many other issues to resolve that it don't seem worth it to me. If ya wanna hang sumpin' onto an AR180B like a Sure-Fire light or a vertical fore-grip, I'd consider trying a DIY by drilling a few bolt-holes thru the bottom handguard and bolting a Picatinny-rail section underneath; there's enough clearance between the barrel and handguards that you'd have plenty of room for a fastening nut or two.
Badger, if you REALLY want metal heat shields in the AR180B's handguards, you could order a set of AR180 handguards from Numrich Gun Parts Corporation - the older handguards DO have metal heat shields, and I'm pretty sure they'll work.