We tested the Unis quite extensively. The 4,5/3-I designation is for a NATO primer where the “N” designation is straight 5.56 (counterintuitive).
As for cup thickness = durability. Not always true. As for Unis from the 5.56 designations. They run on the harder side of the spectrum and tend to be good for upper pressure and near op loads.
As for cup thickness = durability. Not always true. As for Unis from the 5.56 designations. They run on the harder side of the spectrum and tend to be good for upper pressure and near op loads.
