The Otter Creek Labs OCM5 is an improved version of the legendary ops Inc 12th model and AEM5 while staying true to the aesthetics and mounting system. Staying true to OCL's 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. Everything that the ops Inc 12th 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.