Our Umarex Origin Models...
The Big Air Origin mag was designed for the budget friendly accurate Umarex Origin rifle. The mag height works well with medium scope rings. We have the 22-cal, 12-shot version.
We designed the Origin mag with a snug friction fit on the barrel to hold it in place. We oversized the grippers a bit to prevent a loose fit and to account for the tolerance we've seen between different rifle barrels and breech wells. You'll need to firmly pop the mag into the breech with your palm the first time. This will allow the grippers to conform to the barrel and after a couple insertions the fit will give a nice easy snap in and work great.