Well to be honest, you are right but I'm playing along. It's not a military-type weapon, it's a semi-automatic rifle made to look like a military-type weapon (like an M-16 or M4). The ammo caliber is different and it's not fully-automatic. Altering to make it full-auto is illegal but that's true of any semi-auto rifle.Did you include AR-15s on military type weapons, because I'm pretty sure they aren't. They just look spooky.
Same thing holds true for an AK-47. If it's designed as full-auto, it's a military weapon. If not, it's just another semi-auto rifle like an AR-15.
Based on this then none of those 49 mass shootings involved a military type weapon.