The System #2A is the newest version of the R.A.D. 2 system.  The OAL of the unit is 1/8" shorter than the original and 2oz. lighter in weight.  The new adjustment allows for single point pad adjustment without going through the pad or removing it to do so.  This key feature allows the unit to be adjusted by a gun fitter while the gun is mounted saving time and allowing for a more precise fit.