The OCM5 is an improved version of the legendary ops inc 12th model and AEM5 while staying true to the aesthetics and mounting system. What? Improved? How dare you! Yes, improved. Staying true to their precision rifle roots with accuracy and POI at the forefront it's lighter, it's quieter, it has less back pressure and is still full auto rated. Why get stuck using tech that's older than you when you can look the same and mount the same? Welcome to the 21st century cloners. Everything that the ops inc 12th model (the only true clone correct model) and AEM5 will mount on, so will the OCM5. All of your legacy OPS/AE brakes and collars will still work, everything is completely interchangeable.