I swap uppers on my Noveske SBR going from 5.56 to 22LR and back. Noveske makes an excellent product and the take down pins are quite snug so I needed to improve their functionality. The V7 pins do just that. They are light, they are very smooth and beautifully finished, they fit perfect with no play or sticking, they have the perfect extension with the hex head design affording a great hold to reliably pull out the pins yet not too much protrusion to be concerned about getting caught on gear or the environment and they slide back in smoothly for a solid lock up. Bought four sets to install on all my Noveske SBRs.