The Grabber is gauge specific as far as mine appear to be. I converted a basic 600 Jr to a different gauge and it was more work than it was worth - and I got the conversion unit for free! At full price, the conversion unit ran almost half the price for a new Jr. From what I learned, I would have sold the Jr I had and bought a new reloader for much less work and aggravation. To this day the converted unit does not put out as nice appearing shells as when original. Based on this, if the Grabber is convertible it would be a major pain and expense to change it.
