It appears to me that the muzzle lug would be very easy to reinforce. The breech lug maybe a little more difficult but doable. As far as the difference between Z5 and regular, it would be cool to see the difference if any. Thanks for confirming, (there would have been an equal amount of appreciation for noting a misunderstanding), my impressions of the how the design works.

I have another question since it is not easily discerned from the photo. In the lug area. Is the barrel resting on the edges of the stock? and how high up do the lug sockets go? The ramrod goes through there somewhere so I figure no higher than the bottom of the ramrod. If so this is another significant difference in lug support as the Apex/Kodiak support wraps around the ramrod in the shap of a U, this same support, providing support for the barrel and is actually where the barrel beds the stock.