From The Manufacturer/Wikipedia/People Smarter Than Us:
The DT Sport has a 16″ light weight barrel with 1×9 twist, 6 position M4 stock, CAR handguards with single heat shields, and A2 flash hider. The DT Sport comes with 1x 30rd magazine and a CA approved Gun Lock. Shipped with a Chamber Safety Tool in the chamber, clearly showing the weapon is unloaded.