A factory CF FX 480cc? Let me know because the 500cc Luxfer 3600 bottle I have is a smidge to fat for my 0.753" barrel to lay flat. It's a 29" SS heavy barrel so the slight incline I get adds distance and support for the Elite block. I mean it holds it with a FX extra long skinny tube but now that I tried a CF bottle ( seen on Royal .22 400) It's a catch 22. There's pluses to both.