The B76 is fairly rare, I believe only 10000 were made. The quote refers to the fact that the B76 is a classic single/double action design with an outside hammer. You can drop the hammer, manually, on a loaded chamber and fire the first shot double action. There after you go to single action. It's simiar the CZ75.. It came in in the late 70's in Europe but it didn't make the grade for a variety of reasons: It's a bit complicated for soldiers to strip, it's got a singlr stack mag (the standard NATO pistol is the Browing Hi-Power) and it's not reliable enough for service use. I've had one for 20 years and, while it's fun to shoot, it's a fussy eater. It really only likes fmj round nose. It's most striking feature, besides the difficuty of the field strip, is thta it has a fixed barrel which makes it very suitable for mounting a sound moderator. There were rumours in the 80's that some special forces units were looking at it for "sentry bashing".
There are some for sale on the web from time to time. You could try http://www.gunbroker.com. I saw one there a few weeks ago for $450.