| 摘要 |
A readily replaceable bolt face for a firearm ( 10 ) with a movable slide ( 12 ) that strips a round from a magazine, extracts the spent round from the firing chamber and then ejects the round from the firearm by means of an ejector. A bolt face insert ( 32 ) has an external configuration that is common to a range of calibers, but with a bolt face side ( 66 ) designed to fit the rim of a specific caliber or calibers having the same rim dimension. The insert may be replaced to fit a different caliber without replacing the slide. The bolt face insert is provided with a slot ( 62 ) for the ejector and a groove ( 60 ) to accept an extractor for the specified caliber.
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