Probably not that relevant, but I just got my NM Blackhawk back from Ruger Service due to excessive cylinder gap (.012+). They replaced the cylinder, but charged me $192. Not complaining though.
I’ve purchased two guns from them, a Mini-14 and a Ruger NM Blackhawk. Both were their “certified” guns and both were in excellent condition. Had no issues at all. Like most dealers, you have to shop and compare.
I have been a 7x57 fan since my first Mauser back in the mid 70’s and the Interarms Mk X has been one of my favorite actions. I currently have 4 and just received another from my gunsmith that he rebarreled to 275 Rigby. It’s going to be a clone of the Euro sporting rifle.
Be careful if you go the brass screw route. i picked up some that were actually plated steel. Carry a magnet with you to be sure.
i ended up buying a short piece of brass rod from Grainger.