If I was filling out that form, I'd put "AR-15 9MM Carbine" and attach a pic. You're not going to have to engrave it, so it's not like picking the longer version makes you do extra work. If that's not what they want, they'll send you and error letter, most likely with a suggested correction, and you'll probably lose 2-3 weeks. With my luck, it wouldn't matter which one I picked, it would be the wrong one.
Other option is to just out AR-15 as model, and then 9MM Carbine in 4h to cover additional markings on the firearm.
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