Tanfoglio Hammer SPRING #1, 9,5 Lb, XTREME LIGHT,

TANFOGLIO XTREME HAMMER SPRING LIGHT FT30XTR00018

Hammer Spring for Tanfoglio pistol below. 
Strongest on top, and weaker below.

Nr 5: Hammer Spring 21,0 Lb, DUTY PISTOL, STOCK DA pistol FT03MOL00038
Nr 4: Hammer Spring 17,0 Lb, UNICA DA pistol / Std SA Pistol FT03MOL00041 130AB
Nr 3: Hammer Spring 14,3 Lb, XTREME Medium FT30XTR00052
Nr 2: Hammer Spring 13,5 Lb, UNICA SA, CUSTOM pistol FT03MOL00006 138AA
Nr 1: Hammer Spring 9,5 Lb, LIGHT XTREME, CUSTOM FT30XTR00018

DA = Double Action pistol
SA = Single Action pistol
XTREME = Gunsmith Custom Master Shop

All Hammerspring will fit all fine in all tanfoglio Pistol, regardless if it is a DA, double action, or a SA, single action pistol.
The name of the spring shows what it was intended to be installed in from factory.
All Tanfoglio Force .22 Pistols has the #5 hammer Spring installed from factory.
PRO TIP: Change hammer spring every 3000 rounds. (The hammer spring lives a hard life)