IMR 4451 is an extruded powder known for consistent ignition from .223 Rem to larger calibers. Featuring a 1.7% burn rate and 13.8g/cc density, 4451 provides uniform results enhanced by ENDURON Technology for even less deviation in ballistics.
Polymer80 Patriot Pack – AR-15 80% Lower + Easy Jig Gen 3 + Premium Drill Bits & End Mill. Everything you need to finish your build legally. In stock—ships today!