You must have one of these if you forge on AR platforms. The front release pin detent spring LOVES finding hidden spots in the garage or workshop. Never to be found again! This little gem of a tool will help prevent all of that. (PLASTIC to anyone who got this idea using a simple product like THIS needle!) VERY HAPPY with my purchase. (I got THREE of these when I made the purchase so I could have one in my blacksmith toolbox, closet and one in the glove box of the gunnery event truck.)