These are the 3rd generation of the VERY popular SCM modifications from AKA. These 3rd generation is designed to be even more consistent than the version 2, is less prone to creeping and is much more inexpensive.
- Self compensating low pressure regulator.
- 72 psi factory default settings.
- The pressure creep problems of the previous versions are fixed.
The AKA SCM-III LPR is newer, so it should be commonly available, both new and used.