Having just seen the FRA meeting minutes I would like to ask a similar question again.

I am looking into using a bottle jack as part of a weapon. These are entirely self contained, but use hydraulics internally. I have no idea what pressures these jacks use but since types with lifting capacities up to 20 tonnes are commonly available I expect they can be very high. The better types appear to have safety features so they cannot exceed their rated capacity.

Are these subject to the FRA rules on pressure limits and test points? I think pressure could be determined, but adding a test point would be prohibitively difficult.