HM Defense HM50B2 Gen2 50 BMG Black Cerakote Bolt Action Rifle - 29.25in Chambered in 50 BMG CIP, the HM50B2 has a 29.25in, 8 groove barrel with 1: 15in twist ratio. Muzzle Thread 1in-14 TPI. Match Grade; button rifled for superior accuracy. Patented HMB bolt made from 9310 steel. 14in 1913 Picatinny free floated billet rail is CNC machined from aircraft grade aluminum. 7075-T6 billet upper receiver with 1913 Picatinny rail flat top. Left bolt/Right port ejection. HM50B2 billet lower receiver is CNC machined from aircraft grade aluminum. Includes (1) 10-Round Magazine Hard Case with Laser Cut Foam HM Target Trigger ERGO Tactical Super Ambi Grip HM50 Bipod with Sled Feet HM Precision Adjustable CNC Machined Stock Removable Monopod Mount Included *Scope, Scope Mount and Monopod Not Included*