Never yet had an extended floorplate release button come adrift. They are secure.
The floorplate itself is somewhat sensetive as to its fitting to the bottom metal. Too tight, and it becomes difficult to remove. Too loose and it rattles about. Even the loose ones always stay on the rifle until you want it off.
Most are very well fitted from the factory though.
That is a wonderfull working rifle you have there.
Thanks for the information, and my rifle appreciates the compliment