Webley Flare and Riot gun for sale on Gunbroker, and only 10 hours to go, and looks to be sold. Built on a Webley Mk. IV chassis, it also includes a shoulder stock, which in itself is pretty desirable. It's not going cheap, but should be reasonable. Downsides: Federal Labs nickel plated everything. The hammers been cut (I hate it when they ruin a perfectly good Webley hammer, do they think they grow on trees?) Upsides: Did I mention a shoulder stock? Also has a pretty intricate gas round with folding fins. It'll sell today...
Update: This gun sold for $575.00