Hello Peter, I admire your HAC, a very nice example. I have A55 in my collection. Though they made very few revolvers, I think what HAC did make compare very favorably with the products of Enfield and Albion in the UK. The interchangeably tests conducted by the Australian military inspectors was far more rigorous than what the British made No. 2 MK I* revolvers would have been require to pass. All of the No.2 MKI* revolvers required a degree of hand fitting to get the timing right, including the ones made in the UK. Parts like the barrels, frames, side-plates and cylinders were numbered to match for a reason. Anyway, that's my two cents as an armature gunsmith/collector.