I'm going with this one for the car trunk in the city, the 7.62 x 39 (AK Platform) is not great for urban situations.
"The IWI Tavor has been in service with the Israel Defense Forces (IDF) since 2001. Now IWI US is offering the Tavor SAR, a semi-auto version, to American citizens. It employs a long-stroke piston operating system and uses standard AR magazines. SARs are available with 16.5- or 18-inch barrels, and shooters can choose a model with a flattop or a Mepro 21 reflex sight. (iwi.us; 717-695-2081)"
Specifications: IWI Tavor SAR
Caliber: 5.56mm NATO
Barrel: 16.5 or 18 inches
OA Length: 26.13 inches
Weight: 7.9 pounds (empty)
Stock: Synthetic
Sights: Flip-up front and rear
Action: Black or Flat Dark Earth
Finish: Missing copy
Capacity: 30+1
MSRP: $1,999