Introducing the Area 419 bolt knob, meticulously engineered to elevate your shooting experience in both competitive and general use scenarios. This innovative bolt knob stands out with its signature finger groove, expertly crafted to enable seamless bolt manipulation using just your pointer finger. Say goodbye to the hassle of finding the perfect grip each time - the intuitive design ensures your finger naturally aligns with the groove, guaranteeing the quickest and most fluid bolt operation possible. Complementing this feature are two strategically placed knurled surfaces on either side of the groove, providing a secure and confident grip. Whether you're in the heat of competition or enjoying a day at the range, the Area 419 bolt knob promises unparalleled performance and reliability. Manufactured in the USA using 6061-T6 aluminum and finished with a flat black anodization The bolt knobs for defiance and Remington are threaded with a 5/16-24 thread pattern