Each of our instructors brings decades of real world experience to the classroom. Students find our classes to be exciting, informative and full of practical advice. With the growing need for security, CFI is a name that individuals and companies have learned to trust for quality training.

Florida Office


Ms. Cory Manthei, Managing Partner & NRA Law Enforcement Firearms Instructor for Certified Firearms Instruction, LLC. Retired Sergeant Saint Paul Police Department, MN. Florida "K" Firearms Instructor & "DI" Security Instructor – "D" and "G" Security Officer; College Adjunct Instructor for Criminal Justice Courses; Former Instructor for Minnesota Law Enforcement State Training Academy; Past President of Minnesota Law Enforcement Explorer Association; Member FBI-Law Enforcement Executive Development Association.



Mr. Eddy Manthei, Training Coordinator & NRA Certified Firearms Instructor for Certified Firearms Instruction, LLC. Retired Deputy Sheriff, Scott County Sheriff's Department, MN. "DI" Security Instructor. Florida "D" and "G" Licensed Security Officer; Member of Special Response Team Scott Co. SD; Past Board Member of Minnesota Law Enforcement Explorer Association.



Mr. David Clay, NRA Law Enforcement Firearms Instructor for CFI. Retired from the USAF as an instructor for Nuclear, Biological, Chemical and Weapons of Mass Destruction. Over 20 years with a central Florida Sheriff's Office. Instructor for combat handgun and rifle, officer survival, taser, simunitions and Remington 870 shotgun. Firearms Armorer. Competition shooter with medals for the last seven year in the Police and Fire Games, including a Gold Medal for Three Gun during the International Games.



Mr. Dave Templeton is an NRA Certified LEO Handgun, Handgun, Rifle, and Shotgun Instructor. He is a retired State Trooper with 29 years experience with LEO Standards and Training. When not Training Adults on the range, Dave enjoys fishing, hunting, and works with the Boy Scouts of America. Dave enjoys the science of ballistics and enjoys testing. When not on the range Dave still teaches Traffic Homicide Investigations and Reconstruction.



Mr. Chuck Cornelius, NRA Certified Firearms Instructor, Personal Firearms Instructor and “PEN” Personal Defense Instructor for Certified Firearms Instruction, LLC. Retired Military and retired Federal Government specializing in training Special Operations components for US Embassies overseas. Florida “D” and “G” licensed Security Officer and Executive Protection. Korean Certified 2nd Degree Blackbelt in Tae Kwon Do. Over 30 years of Military Combative Instruction and training.



Mr. Sean Beery, is a NRA Law Enforcement Firearms, FL "K" Firearms, FL "DI" Security Instructor for CFI. U.S. Army Infantry - 8 Years of Service; FL "D" Security Officer; FL "G" Security Officer; FL "CC" Private Investigator Intern; NRA Certified Instructor - LEO. Competition Shooter GSSF, ICORE, IDPA, USPSA, SCSA, USCCA, USCA; Certified Armorer. Owner of Volusia County Gun & Hunt Club.


Mr. Chris Manfre, more to come...​


Mr. Bob Burch, more to come...


Meet Our Staff

Georgia Office


Serving the Atlanta, Marietta and Smyrna areas

Certified Firearms Instruction, LLC now offers an array of firearms training and gun certification courses in the Atlanta, Smyrna and Marietta, Georgia areas. In addition to gun safety and firearms training courses, concealed weapons classes and certification for Georgia Weapons Carry Licenses. Of course, we offer all Georgia gun certifications, including the Georgia Weapons Carry License.


Mr. Michael Koenig, founding instructor of Certified Firearms and Director of our branch location in Atlanta, Georgia. NRA Certified Firearms Instructor for Certified Firearms Instruction, LLC; former Law Enforcement Officer in State of Maryland; NRA Qualified High Power Rifle Expert; Member of the American Bar Association and training specialist in State Gun Laws. 

Certified Firearms Instruction Security and Gun Saftey
To Learn More Call:
386-871-2714