Here’s a close look at the damage from the .223 round. It’s not my best shot, to be honest. I missed the spine and creased the mag, but the bullet clearly tumbled and took out that big chunk out of the front. The spring on the inside of the mag was also all kinked up from where the bullet creased it.
The shotgun test and the pistol test were mostly just clowning around, but this was actually impressive. I couldn’t believe the magazine held together, and also held all the cartridges correctly and fed them. I was genuinely impressed by this result.