The Best Survival Deadfall Trigger is one that is Light weight, Durable, Repeatable, and quick to deploy. Carving triggers is time consuming and material dependent, when sheer numbers of traps count, something lightweight makes much more sense to carry in a bag a dozen of these weighs well under 2 lbs.
http://www.selfrelianceoutfitters.com
http://www.selfrelianceoutfitters.com