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Hi Freddy, It is a bar with a slot that prevents the trigger from being pulled unless the center bar is activated to release the trigger for rearward movement. Pictured here : google.com/search?q=trigger+safety&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi-55fP2ZbaAhVLdt8KHfOGB3oQ_AUICygC&biw=1280&bih=618#imgrc=JZ0lRDdcpnqQ_M:

It is a bar with a slot that prevents the trigger from being pulled unless the center bar is activated to release the trigger for rearward movement. Pictured here : google.com/search?q=trigger+safety&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi-55fP2ZbaAhVLdt8KHfOGB3oQ_AUICygC&biw=1280&bih=618#imgrc=JZ0lRDdcpnqQ_M:

It is a safety that prevents a gun from being fired unless the trigger is pulled (like a Glock) here is a good description http://firearmshistory.blogspot.com/2011/07/safety-mechanisms-integrated-trigger.html