"The internal mechanisms are simple enough," he mumbles, thinking back on their earlier escapades. "Our original gun was structurally sound, it was the ammunition that was the problem---so we'll need to make sure we have the right suppressant. That suppressant injection also needs some electrical stunning component attached."

Billy's built guns before, but never in a situation as critical as this. He nodded at Angie's assessment, trying to channel that stress into something positive.

He lays out their stored spare gun parts and starts selecting the common ones that any type can use. "We need to acquire the suppressant, design the cartridge to pierce him deeply enough to have an effect, and give it plenty of a stunning charge."