Patent ID: 8745911

Claim:
A bolt assembly for use in a firearm that is capable of selectively ejecting a spent casing in either a first ejection direction or a second ejection direction, the bolt assembly comprising: a bolt front half piece having an extractor slot capable of extracting and ejecting the spent casing; a bolt rear half piece configured to mate with the bolt front half piece; an elastic body received in the bolt rear half piece; and a bolt interlock received in the bolt rear half piece and movable longitudinally with respect to the bolt rear half piece such that, when the bolt front half piece and the bolt rear half piece are mated together with the elastic body disposed between the bolt interlock and the bolt rear half piece: when the bolt interlock is in a first bolt interlock position, the bolt front half piece is interlocked axially with respect to the bolt rear half piece by the bolt interlock to eject the spent casing in the first ejection direction; and when the bolt interlock is in a second bolt interlock position, the bolt front half piece is rotatable axially with respect to the bolt rear half piece to eject the spent casing in the second ejection direction which is different from the first ejection direction.