Needed to file a bit - Rival Arms Guide Rod Assembly

Using with SIG SAUER Spectre Comp Slide Assembly P365/P365XL/P365X 9mm Luger w/ Integrated Compensator and X-Ray3 Day/Night Suppressor Sights and Wilson Combat frame. Call me a hack idiot, too lazy to return item but it wouldn’t fit/function until I filed down the circumference of the end that contacts the barrel just a bit. Tried two different barrels, neither worked at first but after filing down the factory Sig barrel works with this spring. I’m sure somebodys out there will tell me why I shouldn’t have done this.