| 摘要 |
A receiver assembly for a firearm slidably and rotatably carries a bolt having a non-rotating cartridge extractor-guide at the forward end which allows the bolt to rotate relative thereto and the bolt head has locking lugs which engage a locking surface in the forward or barrel end of the receiver when the bolt is in the firing position. A flexible feeding ramp in the firing chamber surrounds the extractor and serves as a cartridge guide and pre-loads the bolt axially in the firing position. A firing pin carrier assembly provides axial center line absorption of the firing mechanism forces while providing an off center firing pin tip required for rimfire ammunition. During the initial firing sequence the feeding ramp absorbs vibrations caused by the moving components of the firing mechanisms and the impact of the firing pin and the subsequent shock of ignition, and bullet movement. During the latter stages of the firing sequence the firing pin carrier assembly absorbs the shock of the firing pin cocking rod and sear assemblies thus reducing after shock vibration and contributing to firearm accuracy.
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