Well the "block" is nothing more than a contact point for the friction to take place. See, a true locking mechanism that justifies a retention level is one which, while activated, completely prevents the handgun from being drawn. Any sort of "tension" just makes it more difficult to draw the handgun, but it does not prevent it.
I do realize that the package, website, and everything else falsely represent the retention level. That's why I'm not very happy about it
. The problem is, it all comes down to the fact that, asfar asI know,the retention levels are not written in a book anywhere as an officialguideline for all holster manufacturers. Rather, it is simply a widely known and understood theory that most people go by.
EDIT TO REPLY TO MOST RECENT POST:
The Safariland designs that require the gun to be rocked in order to draw are physically locked into the holster by a mechanism. If the gun is pulled directly up, it will not come out no matter how much force you apply (until something breaks). It cannot be drawn until the mechanism is unlocked by rocking the weapon rearward. THAT is what constitutes a retention level. Some action must be performed to deactivate the locking mechanism before the weapon can be drawn.
The Safarilandholster I use has an ejection port lock that must be moved with the thumb before drawing. It also has a tension/friction system that allows theholster the be tightened in order to hold the weapon in place whether the ejection port lock is engaged or not. Going by Blackhawk's theory, this would be a Level 2 holster, and would meet the minimum requirement for many law enforcement agencies. Safariland, on the other hand, will tell you right away that it is Level 1, and they would strongly suggest it not be used in a "duty" environment.