Herbert,
I would be VERY CAREFUL abouy Torch Blueing any Tempered Parts, ie; Springs, Extractors, Ejectors, or Magazine Latches.
The temper of these parts are critical and if over heated they may not be servicable and fail prematurely.
I would advise much practice before attempting Straw Tempering with a Torch.
Even after more than 40 years of experience I still Practice on similar sized steel scrap before the tempering of an actual part.
Viggo
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