David, no mischief intended.
Just a geniune query as, when I was in discussion with ACR they were unable to guarantee or confirm whether it was possible for all thell original parts would be from either the same factory or the same year. However the vagueness of their replies on this could have been down to dealing with a salesman, not a qualified gunsmith.
I am fully aware of the claims ACR make for their rifles and Section 1 compliance regarding ACPO FELWG and the FSS letter - hence the query.