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Umarex Notos Plenum Kit

So, it's possilblle to install the plenum without taking the OEM moderator off?
No it will only fit if you use something to remove part of the bottom of the moderator so the air tube can clear it. I used a angle grinder with a flap disc to remove it. I marked the bottom of the mod while it was installed then with the barrel off and air tube with plenum installed I marked how far up the plenum I needed to remove material. It worked fine doing it that way