Yup, WellPro pumped out a few versions, some with increased mag capacity (from 1200 to 2800 rounds), longer barrels, different grips and in one photo there seems to be a retractable stock.
Since we're here:
I ordered some slightly wider o-rings (16.5mm ID x 2mm thickness against the stock 16x2 ones)to attempt to fix the air seal.
I'm now looking at hop rubbers, usually I'd go with maple leaf but a) there's 5 and b) I only run 0.25s in this so ML is overkill, I don't need mega accuracy but I would like a few more metres of range to be on par with a half decent non r-hopped AEG.
suggestions?