[WT]

In addition to what already has been said,
1. The Series 80 has a shorter firing pin which also has a cut-out for the firing pin plunger. This firing pin has been known to break.
2. The Series 80 also has a different hammer with the half-cock notches relocated so the hammer sits lower at half cock, thus not having enough potential energy to fire the cartridge if the trigger is pulled.
3. The Series 80 also has a larger ejection port.
4. Of course, the dreaded firing pin plunger which locks the firing pin and prevents the pistol from being fired when dropped.
5. SOME Series 80's MAY have chamfered magazine wells.
6. Series 80 triggers are generally longer, mimicking the original WWI version which was replaced with shorter triggers after the war.
7. Series 80's generally have larger sights.