When youre looking for maxim defense ingenuity in a new standard ar-9, the md-9 is your answer.The md-9 was engineered to fit the growing demand for cutting-edge ar9 style rifles for todays military and commercial market.For increased comfort and versatility every mdx features our free-floating barrel with our custom handguard.These handguards provide a monolithic-like upper receiver platform and m-slot compatibility.