NRA-Certified Firearms Instructor & Founder of OXYS Practical Defense LLC — committed to practical, real-world training for law-abiding citizens.
Donald Emmack founded OXYS Practical Defense LLC with a clear purpose: give law-abiding Missouri citizens access to high-quality, practical firearms instruction that goes beyond the minimum required by law.
As an NRA-certified instructor, Donald brings structured, nationally recognized curriculum together with real-world experience and a genuine respect for every student who walks through the door — regardless of background, experience level, or why they've decided to carry.
His instruction style is direct, patient, and focused on building durable skills. Small class sizes are intentional: when you train with Donald, you're not just filling a seat. You get personalized attention, clear feedback, and the confidence that comes from actually knowing what you're doing — not just having a piece of paper.
Donald is also a U.S. Law Shield partner instructor, which means he can connect graduates with legal defense coverage — an often-overlooked but critical layer of protection for anyone who chooses to carry.
Every element of our training reflects a core set of values.