The surface is extremely smooth and the Castle engages well. The closure is easy to operate, and goes on until you push the slider only down and then press ENTER. Without pushing the shutter is also not by accident, even if it presses with full force. If you take the part in the hand, it is believed due to its low weight it is made of plastic and would not trust him with his life. Therefore, I have the carbine loaded with 100 kg of - without any reaction. Then as extreme test (do not try this on the rock face) a trial under this load operates the lock. It was open, close and lock again - under 100kg! Unbelievable.
