Specifications: Caliber: 223 Rem Twist rate / Number of grooves: 1:7/6 Magazine capacity: 10 2nd Trigger pull weight: 2/2.5/3/3.7 1st Trigger pull weight: 0.89-1.34 lbs Receiver size: I (mini) LOP: 5.63-13.66 in Cheekpiece: Yes Stock finish: No Stock: PDW 1+3-position Telescopic Muzzle thread: M15 A- 1 Barrel profile: Semi-Heavy Overall length: 27.16-35.03 in Weight: 6.13 lbs Trigger type: Two-stage Adjustable Sights: No Barrel length: 16 in