An insertion tool facilitating assembly of a surgical instrument includes a housing defining a distal end portion, a proximal end portion, and a central lumen. The central lumen extends therethrough the housing between a distal opening and a proximal opening, and defines a proximal portion and a distal portion. The central lumen is configured to receive a portion of a pin within the distal portion thereof. The insertion tool further includes retention channel defined about the housing at the distal end portion thereof. The retention channel is in communication with the central lumen. A D-ring is at least partially seated within the retention channel and extends into the distal portion of the central lumen to retain the pin therein by applying a compressive force to the pin. A plunger is configured to slide through the central lumen to deploy the pin distally from the distal opening of the central lumen.