Volquartsen Firearms Firefly Bolt 2.0 Black. The Firefly Bolt upgrades your Ruger 10/22 for optimal subsonic performance. This CNC-machined Type III hard-anodized aluminum bolt is lightweight and designed to cycle with a wide range of subsonic ammo from CCI Quiets rated at 710 fps to subsonic 22 LR rated at 1050 fps. Our recoil rod allows the recoil rod spring to be easily changed. In addition to the ability to change springs our new recoil rods are precision-ground hardened A-2 rods varying no more than .001" over the length of the part which means incredibly smooth cycling. The Firefly Bolt comes standard with two springs (reduced power spring installed) allowing you to tune your bolt for your setup. Specifications for Volquartsen Firearms Firefly Bolt 2.0: Manufacturer: Volquartsen Firearms Color: Black Package Contents: Volquartsen Firearms Firefly Bolt 2.0 Volquartsen Firearms VF10FY2: Firefly Bolt 2.0 Black