IRMT-3 V3 billet upper
Seekins Precision’s Integrated Rail Mounting technology (IRMT) uppers integrate the rail mounting points into the upper retaining the stiffness of a true monolithic upper while allowing the rails to be completely modular. This new upper design is considerably thicker in the most critical area and will aid in squeezing all of the potential accuracy out of your AR15 rifle. Instead of a standard barrel nut our IRMT system uses an externally threaded, Steel barrel nut with 1-1/8” wrench flats on it for simple installation. No special proprietary wrenches needed.
The IRMT-3 V3 Upper is only compatible with the Seekins Precision SP3R V3 rail system.Link to parts manufacturer