The Geissele Reaction Block® 05-314 is designed to aid in the assembly of lower receivers. Once the armorer has installed the buffer tube, the lower receiver can then be slid into the Reaction Block at the 12, 3, 6 and 9 o’clock positions, allowing the armorer to rotate the lower receiver by 90° increments in the block simply by loosening the provided nylon screws, removing the lower receiver and sliding it back in at its desired orientation.
The Reaction Block provides an ultra-stable platform for performing an array of lower receiver operations as well as making the installation of the buffer retainer nut quick and easy, all possible while keeping both hands of the armorer free to work, saving both time and frustration. This model is only for a Mil-Spec buffer tube. Mount it firmly in a standard bench vise to secure your build during assembly and precision work. Essential for both novice and experienced armorers working on AR platform rifles.
