Fireworks.org – The World’s Fireworks Community › Forums › Rules & Regulations › What’s the difference between 1.4G and 1.3G fireworks, and do I need a different license? › Reply To: What’s the difference between 1.4G and 1.3G fireworks, and do I need a different license?
Great question. The difference is mainly the net explosive weight and how they’re classified by DOT/ATF. 1.4G is consumer grade ??less explosive content, stricter limits on how much powder per shell. 1.3G is for professional use ??bigger payloads, more flash powder.
For the license part ??you’ll need an ATF Type 20 FEL (Federal Explosives License) for 1.3G. Plus most states require additional permits. It’s not impossible to get but it takes time and paperwork.
There’s some good info in the Rules section here if you search around ??I remember a thread that went deep into the ATF requirements.