A stock assembly for a firearm, the stock assembly comprising a buffer catch comprising a movable buffer catch body; a receiver extension comprising a buffer tube; the buffer tube comprising a buffer tube body and a tubular passage within the buffer tube body; the buffer tube body comprising a buffer catch receptacle extending through a wall of the buffer tube body extending along a longitudinal axis of the buffer tube; the buffer catch receptacle configured to receive the buffer catch body therein; the buffer catch body configured to move within the buffer catch receptacle from a home position to a depressed position; and, in the depressed position, the buffer catch body blocks at least a portion of the tubular passage of the buffer tube.