Pglasgow
Below is a picture of an Omega stock which Sabotloader posted a while back. Since I have never had an Omega barrel out of the stock, I'm not certain what I am seeing. But it appears to me that the lugs sit in sockets in the stock, so both the rear lug and muzzle lug transfer recoil intoabout an 1/8" to 3/16" section of plastic which bears all this recoil.
What you are describing is correct, but or plus the 2 screws that pass up through the stock. The depth of the sockets is approximately the same as the thickness in thesynthetic stock. In the laminate stock this all different, it is much stonger.
That is exactly why I am going to re-enforce the front and rear of each socket (really is not a complicated project at all). Plus once they are re-enforced I will also bed the lugs in the sockets.
Because of this, what I think is a marginal design, I thought that there might be a difference between a Z5 stock and a regular Omega black synthetic - not so they are the same thing.