I would be very careful and suggest you not attempt to fire blue/re-straw some of those parts - especially springs - if you don't know what you're doing. Those colors come from heating the metal to a very specific temperature. Heating already-hardened steel, springs, etc., will anneal them/ take the temper out.
YMMV
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John 8:32
reive (riːv) vb (Military) (intr) dialect Scot and Northern English to go on a plundering raid
[variant of reave]
ˈreiver n e.g., " Some view the Border Reivers as loveable rogues."
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