Introducing the HK MP5 Timney Trigger. One of the most popular designed firearms in the world is worthy of The World’s Finest Trigger. You asked” we listened and delivered a two-stage” semiauto” drop-in trigger that is easy to install. All trigger parts have been expertly designed and precision machined from premium materials to guarantee a lifetime of dependable service. The trigger housing is made from 6061 T6 aluminum and anodized black to create a weather and corrosion resistant trigger.