I just got a HK SP5, and I'm putting a tri lug adapter in my 9mm suppressor since the HK comes with the tri lug barrel mount.
I just ordered a tri lug barrel mount for my CZ S2.
The tri lug barrel mount is only an inch long and I'll need to take the hand guard off to torque it to spec.
They make a socket style tri lug wrench, but I can't find one in stock.
Looked on YT about hand guard removal, and the only vid's I could find were all for the CZ S1.