Hello, I'm an expert in firearms with extensive knowledge on various types of guns. When it comes to the PPK gun, it's a specific model that has a rich history and is well-known among firearm enthusiasts.

The PPK stands for "Polizei-Pistole Kriminal," which translates to "Criminal Police Pistol" in English. It was designed by the German gun manufacturer Walther in the 1920s and 1930s. The PPK is a compact version of the Walther PP (Polizei-Pistole), which was intended for police officers. The PPK is known for its small size, making it ideal for concealed carry, and it has been used by various law enforcement agencies and private citizens alike.

The PPK gained widespread fame when it was featured in the James Bond novels and films, where it became the iconic sidearm of the fictional British secret service agent, James Bond, further popularizing the model.

Here's the translation in Chinese:

大家好，我是枪械领域的专家，对各种类型的枪支有广泛的了解。当谈到PPK手枪时，它是一个具有丰富历史且在枪械爱好者中非常知名的特定型号。

PPK代表“Polizei-Pistole Kriminal”，翻译成中文是“刑事警察手枪”。它由德国枪械制造商瓦尔特在20世纪20年代和30年代设计。PPK是瓦尔特PP（警察手枪）的紧凑型版本，后者是为警察设计的。PPK以其小巧的尺寸而闻名，非常适合隐蔽携带，已被各种执法机构和私人公民使用。

PPK因在詹姆斯·邦德小说和电影中出现而广为人知，它成为了虚构的英国特工詹姆斯·邦德标志性的配枪，进一步推广了这一型号。

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PPK: 9 (.22 LR), 7 (.32 ACP) 6 (.380). Sights. Fixed iron sights, rear notch and front blade. The Walther PP (Polizeipistole, or police pistol) series pistols are blowback-operated semi-automatic pistols, developed by the German arms manufacturer Carl Walther GmbH Sportwaffen.read more >>