Caliber: 450 Bushmaster – Stock: American Walnut – Front Sight: Protected Blade – Rear Sight: Adjustable – Capacity: 4 – Thread Pattern: 11/16-24 – Barrel Length: 16.10 – Overall Length: 37 – 38.50 – Material: Alloy Steel – Finish: Matte Black – Barrel Feature: Ruger Precision Rifle® Hybrid Muzzle Brake – Length Of Pull: 12.75 – 14.25 – Twist: 1:16 RH – Weight: 6.6 lb. – Grooves: 6 – The forward-mounted Picatinny rail allows for the mounting of modern optics like an intermediate eye relief scope (not included) for both eyes open sighting and super-fast target acquisition. – Also offers a built-in accurate sighting system with ghost ring adjustable rear aperture sight and a non-glare protected blade front sight. – 4-round detachable box magazine with push-forward magazine release just forward of the trigger guard. – Patented integral scope mounts machined directly on the solid-steel receiver provide a stable mounting surface for scope rings eliminating a potential source of looseness and inaccuracy in the field (scope rings included). – Soft rubber buttpad with buttpad spacers allow the rifle to be properly sized for different shooters or varying levels of outerwear or defensive gear (three 1/2 spacers included). – Free-floated cold hammer-forged barrel with ultra-precise rifling that provides exceptional accuracy longevity and easy cleaning. – Rugged and reliable with a glass-reinforced nylon trigger guard and magazine well. – Non-rotating Mauser-type controlled round feed extractor is the most positive case extraction system ever invented and features a fixed blade-type ejector that positively ejects the empty cases as the bolt is moved fully rearward. – Developed with Gunsite this rifle is Gunsite Approved and features the Gunsite name rollmarked on the receiver and engraved on the grip cap. – Also includes: rugged one-piece stainless steel bolt; three-position safety; sling swivel studs. – Features the Ruger Precision Rifle® Hybrid Muzzle Brake to effectively reduce recoil while minimizing noise and blast to the sides of the shooter (thread protector included).