The only known problem with the RWS 850 I am aware of is the spherical plug driven into the bottom of the receiver to plug the long vertical transfer port.... I have no idea what the typical pressure is for that to come flying out of the bottom, but obviously over 1800 psi.... What happens if the regulator fails and you get 3000 psi in the gun I don't know, but a quick email to Roald might bring the answer, and a cure.... You are correct that the HPA versions generally use a 3K burst disc.... Bob