Gun Sales, Evaluation, Training & Appraisals - Gun Dealer NJ FFL Gun Dealer NJ - The professionals at Defensive Security offer gun sales combined with unique consultation and training offerings. Both novices and experts are afforded appropriate advice, instruc FFL Gun Dealer NJ - The professionals at Defensive Security offer gun sales combined with unique consultation and training offerings. Both novices and experts are afforded appropriate advice, instruction, and training for the selection, purchase, care and use of their firearms. Our experts can also assist in the valuation, purchase or sale of your firearm or collection.