No Tim,, I've been using mine for over a year and no problems. The HL circuitry reduces the current going to the machine gun LED from 7.2v down to 2.4v per this diagram, so if you swap out the machine gun LED there is no more that needs to be done. These laser modules are rated at 3v and the seller states that they will function well with 2.5v to 3.3v. The 2.4v from the machine gun function of the HL tanks works fine...