Momentarily-belatedly, standing to defend Oberndorf, in classic production firm context. Several differing styles of securing floorplate to bottom metal! Lever release & in-bow trigger guard type context of "quick release" styles. I have both in a number of rifles and NEVER a problem. I can see such in terms of weak springs, but some (eg Argentine M 1909 military) pushing century as... No problem. Second source of potential failure, the lever release type, hanging there on floorplate "in the weather", so to speak. 'Harm's way' potential. None of mine displaying any damage whatsoever. There 'may have been' certain firms producing such release mechanisms with inferior materials, designs, workmanship/fitment leading to 'casualties'. Oberndorf Mauser was, for well over a century, the standard by which quality mauser production was defined. The "gold standard". Some other large production firms, it's equal (eg: Steyr in Austria; Brno/Cz in Czechoslovakia, FN in Belgium, Husqvarna & Sako, overlapping locale). Yet to my mind, no other production Mauser firm surpassing Oberndorf sporter quality (latter "war years" excepting). Such OR trouble free quality ,absent disasters or "Bubba's" hand!
As speaking of 'other than' steel; typically alloy; another ball game. From Winchester "Featherweight" models with pretty durn good, strong alloy to some 'other' so soft easily defaced, distorted, failed! Hinges particularly susceptible!
Just another wordy take!
Best & Stay Safe!
John