PLR-16 made by kel tec .223 16.5in long uses AR-15 magazines and just for laughs buy a 90 rd or more drum. retails for $650
I would also buy an AR-15 that takes 7.62x39 for a little power.
Kel tec has lifetime warranty and uses klishnikov design and considered a pistol.
If you want to see one look left