The colt federal patrol carbine is an advanced rifle based on colt's legendary m4 platform adding key accessories as requested by the fbi.It features a new geissele mk4 m-lok capable free-floated forend, and a set of magpul pro flip-up sights.Action: Semi-AutoCaliber: 5.56x45mm NATOBarrel Length: 16.10"Capacity: 30+1Safety: Manual ThumbOal: 32"-35.50"Weight: 6.50 lbsStock Description: CollapsibleMuzzle: A2 Flash HiderSights: Magpul MBUS Pro Front & RearTwist: 1:7"Barrel Length Range: 16" to 16.99"Weight Range: 6 lbs to 6.99 lbsHand: RightStock Finish Group: Black