Cold hammer-forged 4140 chrome-moly steel barrel with 5R Rifling at minimum bore and groove dimensions, minimum headspace and centralized chamber. • 20 MOA Picatinny rail secured with four, #8-40 screws for increased long-range elevation capabilities. • "Upper" receiver and one-piece bolt are precision CNC-machined from pre-hardened 4140 chrome-moly steel to minimize distortion. • Three-lug bolt with 70° throw features dual cocking cams and a smooth-running, full diameter bolt body. • In-line recoil path manages recoil directly from the rear of the receiver to the buttstock, not through a traditional bedding system, providing maximum accuracy potential. • Ruger® Precision MSR stock with QD sling attachment points features a bottom Picatinny rail and soft rubber buttpad. The left-folding stock hinge is attached to an AR-style buffer tube and accepts any AR-style stock. Length of pull and comb height are adjustable. • Equipped with a Ruger Precision Rifle® Short-Action Handguard for improved scope clearance for long-range scopes. • Magazine well front is contoured for a positive grip for bracing against shooting supports. • Oversized bolt handle for positive bolt manipulation, with 5/16"-24 thread for easy replacement. Bolt disassembly tool is stored in the bolt shroud for easy striker channel cleaning. Also features a Ruger Precision Rifle™ Billet Aluminum Bolt Shroud. • "Lower" magazine well halves are precision machined from aerospace-grade 7075-T6 aluminum and are Type III hard coat anodized for maximum durability. • Patent-pending multi-magazine interface functions interchangeably with AICS and M110/SR-25/DPMS/Magpul-style magazines (works with some M14 magazines). • Ruger Marksman Adjustable™ trigger is externally adjustable with a pull weight range of 2.25 to 5.0 lbs.; wrench is stored in the bolt shroud. • Barrels can be easily replaced by a competent gunsmith using AR-style wrenches and headspace gauges.