The P415 Series is the pinnacle of all-purpose 5.56 caliber sporting rifles. It is a product of continuous development and improvement to the AR platform that no other rifle company has attempted. E2 Extraction Technology complete ambidextrous fire controls modular free floating rail platform and numerous internal improvements make this rifle the last rifle you will ever have to buy. It simply will not fail when you need it most. - CALIBER: 5.56x45mm NATO - BARREL: 16.5 (1:8) - RAIL LENGTH: 14.5 M-Rail - WEIGHT: 7.5lbs - LENGTH: 32.5-36 (collapsed) - TRIGGER: Standard Drop-In 4.5lb