Abstract: A bolt hold open facility is provided for a firearm with a bolt reciprocating along a bolt path. The bolt hold open facility comprises a latch having a bolt contact portion, the latch being movable between an extended position and a retracted position, the bolt contact portion adapted to extend into the bolt path to restrain the bolt when the latch is in the extended position, the bolt contact portion adapted to be positioned clear of the bolt path to enable movement of the bolt when the latch is in the retracted position. The latch is biased to the extended position. The bolt hold open facility comprises an actuator operably engaged to the latch and adapted to move the latch to the retracted position.