Just try it before you start changing parts. You will probably need the buffer you linked and a Springco orange spring. You may need to also drill out the gas port. Most PSA's also have a gas tube that is a bit short. The PSA rifle I bought had a rifle stock so that recoil system was good to go. I did replace the gas tube w/the proper length tube from Armalite. I also changed to a carbine stock and used Armalite's buffer tube and buffer w/Armalite's spring.
See if it works first. Lots of lube on the bolt carrier group.