Hey Lou, New Zealand wow, welcome to the forum, could you swing by Introductions section of the forum and make an Intro and let the guys welcome ya here to the forum. Thanks.
The AccuRelease of the Acctrigger is designed to block the sear. Initial trigger pressure by the shooter clears the block and lets the sear function normally. But if the sear is accidentally jarred out of engagement with the trigger, the AccuRelease blocks its movement and prevents the rifle from firing.
"There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter." - Hemingway
The greatest ignorance is to reject something you know nothing about.