How to Tactical insertion glitch--Description please read

ok so this is a new glitch my friend showed me. Requirements: One man Army pro; A class with tactical insertion on it. What you have to do is have your class with tactical insertion on. switch to one man army and simultaneously click RB (xbox) this will make u set ur tactical while its switching classes and the tube thing will apear Lol :) thanks to my friend MDxStripes and Ironman057 for lettin me kill them :) also if u sprint u might have to redo