The Enforcer was based on the L39A1 specification; they are basically identical to an L39A1 except for:
1. A standard Parker Hale monte-carlo sporting butt was fitted (same butts as on PH T4s, sporters, etc);
2. Parker Hale scope blocks fitted;
3. A PH 5E4 target sight fitted (this was the latest PH 7.62mm target sight, fitted to an adaptor plate that could be switched for different rifle actions);
4. A special safety lever with an extended bob to clear the target sight (they didn't bother on the L39, as this was intended as a target rifle);
5. A turned "chordal" rilfed barrel instead of the Enfield hammer-forged barrel used on the L39/Envoy/L42 (later, these chordal barrels were accepted as replacements on L42s as well).
The action milling (for fitting of the 7.62mm magazine), forend woodwork, and general preparation are all the same.
Both L39s and Enforcers are in turn practically identical to any number of gunsmith-built target rifles using the same components and cut-down No4 forends.