Hey all! I have owned an lmt cqb mrp for several years now and finally pulled the trigger on getting another barrel. I ordered a 10.5 556 di barrel from primary arms. Much to my surprise the gas tube doesn't fit in my original lmt carrier or my geissele rebcg. I am exchanging it through primary arms since they still show stock but would like to hear feedback from anyone with some insight. I've never built a gun from parts or anything like that but this fitment issue strikes me as odd. Thanks for your input!