The rifle's reliability looks unmatched due to its meticulous construction. Their FN 15® Competition looks made from high-quality aluminum and polymer, ensuring durability and long term performance. The finishing touch to our phenomenal firearm is the chrome-lined bolt carrier team, and reduces friction and increases proper function through consistent lubrication.The FN 15® Competition rifle is chambered in .223 Remington and services the best muzzle brake at the end for the barrel to decrease recoil and ensure accelerated follow-up shots. Furthermore, it includes the best heavy buffer which limits the cyclic rate, lowering stress upon critical section of the firearm — what this means is that the rifle makes sure durability during extended periods of sustained use.