Fx impact mkII

Just got a fx impact mkII love it,thank to a person who I like to say is a best friend and neighbor, I have the high capacity magazine in .30 cal and have no trouble loading pellets, but when it comes to the poly mags they don’t fit because of the red tip. I was going to just cut some of the tip off but was not sure if it would do any damage. Has anyone had this problem.thanks to every one