As per title.
The Jem'Hadar rifle that comes with the new recruits doesn't have an option for re-engineering. This is odd because the pistol that also comes with the recruits DOES have the option for re-engineering.
EDIT: The rifle is part of the 3-piece Jem'Hadar ground set. I take it this means it falls under the 'Featured Episode' rewards exclusion for re-engineering, despite it being issued with new Jem'Hadar characters.