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Take this passage from Agatha Christie's The Seven Dials Mystery. [Emphasis added]

"Do you think you could go out and buy me a pistol, Stevens?"

"A pistol, sir?"

True to his training, Stevens betrayed no hint of surprise.

"What kind of a pistol would you be requiring?"

"The kind where you put your finger on the trigger and the thing goes on shooting until you take it off again."

"An automatic, sir."

"That's it," said Jimmy. "An automatic. And I should like it to be a blue-nosed one—if you and the shopman know what that is. In American stories, the hero always takes his blue-nosed automatic from his hip pocket."

Stevens permitted himself a faint, discreet smile.

"Most American gentlemen that I have known, sir, carry something very different in their hip pockets," he observed. Jimmy Thesiger laughed.

In this passage, what is a "blue-nosed" gun?

In addition, in the 1930s, what would a fictional American gentleman be keeping in his hip pocket?

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Given the publication date of The Seven Dials Mystery (1929) and the dates of Prohibition, it would be a hip flask in the pocket. – Peter Shor Jan 16 '12 at 0:13
As the answers suggest that there may not be any such thing as a "blue-nosed automatic" per se, it would be interesting to look for earlier citations of the phrase, to see if it really was common in American detective fiction. – Nate Eldredge Dec 10 '12 at 14:11
I suspect the "different in their hip pockets" is a flask. – Hot Licks Nov 22 '14 at 23:47
up vote 4 down vote accepted

Here's a forum discussion on suspect is armed with a blue nose revolver that failed to come to any conclusion. But we here at ELU are made of sterner stuff...

This Wikipedia article on the Colt Detective Special revolver says

The Detective Special was initially available in both bright blued and nickel finishes...

I doubt Agatha Christie expected many of her readers to get that reference. She may simply have used it for artistic effect - "blued steel" implies heat-treating, which can either be taken to mean it's a higher-class weapon that's been more carefully manufactured, or maybe that it has been used (the blueing by implication arising from the heat of firing).

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I came across that same article in my Google search before posting. I knew ELU would be able to sate my curiosity. – Jeremy Jan 16 '12 at 3:55
Gun bluing: google.com/… – Wayfaring Stranger Nov 23 '14 at 0:43

With the very greatest respect to the author, she has confused a self-loading pistol with a fully automatic weapon, more commonly referred to as a machine-pistol. Thesiger has Stevens buy a "blue-nosed automatic", which is later described as a Colt, possibly a 1903 Colt Pocket Hammerless. This pistol had a blued finish, a heat and chemical treatment process which has long been a common method of resisting corrosion and imparting a pleasing appearance. Another "automatic" which appears in the story is a Mauser, possibly the 1914 model, also in a blued finish.

So to answer the original query — there's really no such thing as a "blue-nose gun", as any blued weapon will be treated on all its external surfaces — the whole thing will appear a dark blue.

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The distinction between an automatic and a revolver was common well before the first machine pistols/ sub-machineguns. – TimLymington Dec 10 '12 at 10:13

So I am thinking that the blue nose is from the heat effect of repeated use. The metal of a heavily used weapon can take on a mottled blue color... especially at the muzzle.

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