Gen 1: The Gen 1 Arius is most easily distinguishable by having two lock insert screws. They also have a slightly different blade and flipper tab profile but still similar to the Gen 2. Gen 1’s were never available with lightening lockets. These were not made in house.
Gen 2: The Gen 2 Arius is most easily distinguishable by having one lock insert screw and a hooked-shaped flipper tab and is the first generation made 100% in house. Some Gen 2’s have lightening pockets, but not all.
Gen 3: The Gen 3 Arius is most easily distinguishable by having the new style flipper tab with jimping and still has the Gen 2 style lock arm. The Gen 3 backspacer has pins running through the backspacer to provide extra support and better parallelism. Gen 3 is the first generation to be available with a “flipper delete”. All Gen 3’s are made with M390 and all come with lightening pockets.
Gen 4: The Gen 4 Arius is most easily distinguishable by having the new style flipper tab, a much higher lock face (up near the pivot area), and a swooping, less angular, lock arm cutout. All Gen 4’s are designated as such on the inside of the face scale, which can be viewed from the back through the clip/leaf spring window.
This list is for distinguishing between the models and is nowhere near a complete list of changes throughout generations. This list should be used as a reference guide for those curious about which generation you are looking at. If you have any questions regarding the differences between generations, please feel free to email our customer support at
[email protected].