While looking closer at this picture, I realized that ladic has some really good attention to detail:
AR-15 has stickers from Shotaro Kaneda's bike from Akira on her cello case and has the actual design of the Spikes Tactical 10-Year Anniversary AR-15 on her gun, and M4 has on her bag a Marine Corps Expert Rifleman badge, a Marine Corps pewter cap badge (for some reason the only badges made with that design are made out of pewter, so that's how they're specified), and of course the easy one to know - a peace sign button, and also her gun actually has an airsoft company logo - Ares - on it
Now the more I look at it I'm thinking he just took the pictures of the guns off of the internet and drew around them and recolored them - and probably didn't realize that M4's was airsoft, as it has no orange tip