Howdy all -
I guess I'll step in. This is my first posting since the mandatory "Intro" post. Actually, I found this post while surfing the 'net for some incidental information on the shotgun, and decided to join the forum to give you the appropriate answer.
The Hi-Standard Riot-7 (Flite King K120) was an excellent and very popular 12 gauge high capacity pump shotgun used by many police agencies in the 60's. It holds seven (7) 3/4" shells, and it has a smooth, reliable action with a modified choke and notched, flip-up leaf rear sight for use with shotgun slug shots.
I purchased and carried one myself as a deputy sheriff, and eventually modified it by removing the stock and using a Choate Machine pistol grip for undercover and stake out work. It served me well. The 18 1/2 inch barrel brought the overall size down to 20 1/2 inches. In fact, I still have the little rascal.
That is, by the way, the minimum allowable size for a shotgun in California (without having to hassle with special licensing), and the weapon in its current configuration is "street legal" as long as a folding stock is not added to the pistol grip adaptation.
You should have no trouble finding many threads from various sites that mention this great $150 law enforcement shotgun - just Google "Hi Standard Riot 7" or "Riot 18-7" and you will find several entries. A parts list is available at this url:
http://www.e-gunparts.com/productsch...20KING K-120