Short thumbs / first time builder - Timber Creek Ambidextrous Safety Selector

If you hit the selector and it doesn't reach fire (short thumb like me) then you need this. It can be set at what they call 60 or 90. 90 would be on fire. 60 is a shorter distance to fire. Now when I hit the selector I am always ready to shoot. First time builders I suggest you get a white sheet spread it out of the floor. So when springs and pins go flying you can find them. I have already ordered another one for my other AR.