The rmr-30 carbine makes use of aluminum and zytel, and employs a 4140 steel bolt, telescoping/retractable stock, and top and bottom mil-std 1913 picatinny rail system for mounting tactical accessories (flip-up sights, optics, lasers, lights, etc.).Barrel length is 16.1 inches.Metal Finish: BlackAction: Semi-AutoCaliber: 22 MagBarrel Length: 16.10"Capacity: 30+1Trigger: StandardSafety: LeverOal: 29.90"Weight: 4.20 lbsStock Description: CollapsibleBarrel Description: AluminumMuzzle: None, Optic ReadyBarrel Length Range: 16" to 16.99"Weight Range: 4 lbs to 4.99 lbsHand: RightStock Finish Group: BlackMetal Finish Group: Blued/Black