Caleb Downing 07.05.20 Dave Propri SDI is really worth the time and worth the investment. I don’t know where you’d get this caliber of education and knowledge in the package you can get it in at SDI. RELATED STORIES Firearms Tech What to Look For in a Gun Appraisal read more SDI News SDI Press New Certificate in Firearms Technology – Handgun Specialist Program. read more Podcasts Caleb Downing Interview Series, Part 2! read more