Four Epinephrine Auto-injectors Firing into Ballistic Gelatin -- Older Version With Emerade

I fire 4 brands of EAIs into ballistic gelatin to highlight their differences. EpiPen & Emerade have a needle cover, the Impax/Lineage generic has none, and Auvi-Q has a self-retracting needle. The Emerade needle is longer (2.3 cm vs. 1.6 cm).