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Are there any restrictions for using a "modified" pistol for the CHL class? I only ask because...

While in a local gun store I was inquiring about CHL instructors as my permit is coming due and I haven't seen my last instructor advertised anywhere. The indoor range where she taught is now out of business. Anyway, during the course of the conversation, I mentioned that I have a Browning Hi-Power. The store employee, who is also a CHL instructor, asked if the magazine disconnect had been removed. It has and I told him so. He told me that any handgun that had been modified could not be used in a CHL class. I then asked about my HK USP45C. This came from the factory as a "V1" DA/SA with safety and decock, but had since been modified with the HK LEM (Law Enforcement Modification) trigger kit. This makes the gun's trigger more like a Glock. I explained that this is a factory approved modification and he still said that ANY modified gun could not be used for the class.

Is this a state requirement or maybe just a personal requirement of his?