Purple Slide - Pistolsmith

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Old 12-02-2004, 06:08 PM   #1
Join Date: Feb 2003
Posts: 29
Purple Slide

Why do the P7 pistols sometimes have purple slides? I had a P7M8 ten years ago and I bought a P7 PSP and the slide is purple.
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Old 12-03-2004, 02:11 PM   #2
Join Date: Apr 2001
Posts: 63
According to posts I have seen on other boards (try HKPro), there is something about the steel used in the P7's that makes the slides turn purple or brown.
Old 12-31-2004, 09:37 PM   #3
Join Date: Oct 2003
Posts: 147
Could be due to Boron being used as an alloy in the steel. Not sure WHY it does what it does but one can obtain better mechanical properties using Boron as an alloying element.
Old 01-01-2005, 07:54 AM   #4
Senior Member
Join Date: Jun 2002
Posts: 1,559
It may be the alloy or it may just be the hardness. Both can have an effect on blueing.
Old 11-26-2017, 08:29 AM   #5
Junior Member
Join Date: Mar 2017
Location: Miami, Fl
Posts: 19
I always thought it was something to do with the finishing steps HK did.

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