RUGER PRECISION RIMFIRE 8403 - .17 HMR The Ruger Precision Rimfire Model 8403 is a bolt-action precision-style rifle chambered in .17 HMR. It features an 18" cold hammer-forged target barrel, adjustable stock, free-float aluminum handguard, and Ruger's Marksman Adjustable trigger. Specifications Manufacturer: Ruger Model: Precision Rimfire Model Number: 8403 Caliber: .17 HMR Action: Bolt action Barrel: 18" cold hammer-forged target barrel Twist Rate: 1:9" Magazine: 9-round JMX-1 rotary magazine Capacity: 9 rounds Overall Length: 35.13"-38.63" Weight: Approximately 6.8 lbs. Handguard: 15" free-float aluminum with M-LOK slots Trigger: Ruger Marksman Adjustable, approximately 2.25-5 lbs. Stock: Quick-Fit adjustable precision stock Muzzle: 1/2"-28 threaded Scope Mount: 0-MOA Picatinny rail