My dad is a an FN/Browning  A-5 fan.  I just learned that these guns exist and I think it would be cool to add one to his collection.  I dont know much about them other than they were made for Rhodesian riot troops, have an extended mag/foreend, and were imported in low numbers by Century.  

Any other info would be appreciated.  Also, what are the going rates for these guns (my Dad is interested in shooters, not museum quality, numbers matching guns)?

There is another thread right here in the C&R forum about them right now.

They are pretty badass, but tend to fetch a pretty penny.

ETA: Here it is. http://www.ar15.com/forums/t_6_14/430275_Rhodesian_FN_Riot_Shotgun.html

Rare as hell. Sorry. Not many made.

Big bucks.

Collectors firearms in Texas may have one.

I don't know if they're Rhodesian, but Sarco has some for $995 in their shotgun news ads.