| 摘要 |
A bolt for a firearm is described that can be used to chamber, extract, and/or eject different cartridges that have different outside rim diameters. In one embodiment, the bolt includes a bolt head that is configured to engage the rearward end of a plurality of different cartridges. The bolt may include an extractor that is configured to engage the rims of the plurality of cartridges and/or an ejector that is configured to bias the cartridge case out of an ejection port of the firearm. |
