NJ Gun Training, CCW Firearm Certification, & Pro Gun Shop Located in Hazlet, NJ, but serving All Central NJ & Beyond! Ready to improve your firearm skills in New Jersey or get CCW Certified? Duncan Defense is your solution for ALL your comprehensive firearm training and services NJ. Our top-notch training focuses on safety, proficiency, and confidence, empowering our community to protect themselves and their loved ones. Whether you’re a beginner or an experienced shooter, our range of courses has all you need. From fundamental safety courses to specialized training in self-defense and law enforcement preparation, we have the expertise to help you reach your goals