[stefanosg]

I noticed on mine, that when you first slide it on you need to press down on the lever a bit. If you look at the close up of the lever I posted, it is angled slightly upward(The pic is upside down). Press down on it a bit while sliding the stock on. There is a wee bit of play there, but it flattens out that side of the locking mechanism enough to allow it to slide all the way up properly. You may not be all the way up the back of the lug and that is why it wont close all the way. It seems easier to do now that I have done it a dozen or so times. Some of the edges may bit rough until broken in a bit by use.