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Only problem I have seen with them is that the housing is brass and very soft, softer than alu. I also ordered one and it turned into a screw-up and did not fit properly. I would suggest a CG if they have one to fit and then the RPA.
They did have one to fit a Musgrave because I have one on mine. Lots of Musgrave rifles still in use in the UK so I can't see why they would discontinue making them. You might want to check with Paul Rieben at Range Sports Unlimited in Kamloops to see if he has one in stock.
It is set up as a 2 stage at around 2.5 lbs for TR Class. It is on par with my original HHE CG trigger on my Millennium action. I am not sure how light it would go. I am sure there are some shooters using RPA Quadlocks with RPA triggers set really light for F Class.