Shaw 350 Legend Barrel fits AR15 Rifles- The 350 Legend cartridge is an ideal deer hunting cartridge. This barrel converts your 223/5.56 AR15 Sporting Rifle to shoot 350 Legend. You can be hunting deer this Fall with your AR15!- Easy Conversion: The 350 has the same bolt head as the 223. Just swap in this barrel for your 223 barrel. The only thing different is the magazine. And we have 5-Round 350 Legend magazines here for a reasonable price!