I had the same issue as well. It originally came with a unknown hopup rubber and a madbull 6.01 and fit fine. I tried a white Shs rubber with a bravo 6.03, with no success. Then tried the original unknown rubber and bravo and found the bbs would get jammed at the hopup. So I switched to the Shs and a classic army stainless 6.03 and it was a little tight but now it feeds and shoots perfect. I guess it depends on the size of the outside of the inner barrel. Not too sure.
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