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You appear to have a RecoilMaster. From the STI manual:
1. Remove the slide stop (page 22) and the slide assembly (page 23)
2. With the slide assembly off, turn it over exposing the bottom of the barrel and recoil system.
3. For the next step you will need the plastic TAKE DOWN tool provided with the gun.
4. With your thumb push on the guide rod head thus compressing the recoil springs. When the system is at full compression, insert the TAKE DOWN tool between the head of the GUIDE ROD and the front of the SPRING TUBE (see illustration). The captured system will be removed by pulling the guide rod head towards the rear of the slide. If your firearm has a bushing barrel system the TAKE DOWN tool must be rotated to clear the bushing. In order for the recoil assembly to clear the barrel link the TAKE DOWN tool must be rotated towards the barrel side.