Quote:
Originally Posted by sheepherder
My thought was that it pushed the back of the hold-open up and that cantilevered the front end down...But it would require a bit of strength to overcome the magazine spring, and pushing down on the mag button wouldn't do that any good either... 
I'm probably wrong, as I can read blueprints OK but patent drawings/descriptions are just coffee shop scriblings...  |
Pushing the back of the hold open up would engage it; this device has to pull it down.
As far as the amount of pressure to move it- there must be some mechanical advantage built into the mechanism; it would not take much of a lever to move the hold open down the 1/10" or so it needs to disengage.