Been using MEC 600Jr since before the model change.
First, you have to know is it real old model or newer model, or the current Mark 5. Parts are available for all, but some parts are different.
Secondly, to change gauges, you need a conversion kit, which is most parts besides the frame. I decided long ago that it is simpler and not all that moe expensive to have a complete loader for each gauge I use frequently.
http://www.mecreloaders.com/Order/O...0845220&Type=P&PageId=600JrMark5PartsList.asp
(You can buy the conversion kit cheaper through some retailers)
I have a mec grabber in 12 gage that I will sell you for less money than the
conversion kit will cost you, just needs powder and shoot bottles to run, the
bottles from that 600 jr will work.
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