The fn m249s, a semi-automatic version of the m249 saw light machine gun, was originally developed by fn herstal as the fn minimi and adopted by the u.S.Military in 1988.The rifle features the signature 18.5-inch fn cold hammer-forged, chrome-lined barrel and operates from a closed-bolt position.Chambered in 5.56x45mm nato, the rifle will accept both magazine and linked ammunition belt.It includes folding carry handle & bipod.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 18.50"Capacity: 30+1Safety: CrossboltOal: 40.75"Weight: 17.20 lbsReceiver Material: SteelBarrel Description: Removeable Heat Shield/SteelTwist: 1:7"Barrel Length Range: 18" to 18.99"Weight Range: 17 lbs to 17.99 lbsHand: Right HandStock Finish Group: Brown