Well this instructable may clear up any confusion! You see, Gilson has redesigned the P2 and P10 with a "Dual position Adapter" on these two models which allows you to use long and short tips!
Read on weary lab bench warrior!
Step 1: The Gilson P2 and P10 (or P2N and P10N)
Step 2: The LONG position
Step 3: The tip ejector "switcharoo" Step one.
Step one: Grap the adapter.