Regarding the recoil lugs, I have seen pics of one forward lug, pics of one forward and one aft, and pics with no recoil lugs.
In all my info collecting I have never found the what, where, when and why of the differences.
Generally it seems that the later manufactured real Model 1916 had a forward recoil lug. Generally.
And you know, I presume, the rear sight sleeve and the front sight band are soldered to the barrel. There is also a set screw under the blade on the front sight. Knock the blade out of the dovetail and you will find it. Sometimes the front sight band solder breaks loose. You just resolder. Or in my case, I added a scope, ditched the front sight, threaded the end and added a way cool looking flash hider. (Wince). But, hey, I wasn't doing a "mil-storation".
Still have that mil stock for you, BTW. With all the metal.