The first M4 Variant rifle from IWI US this 16 Tactical Rifle includes a 15 Free Float Handguard a B5 Systems Stock and Grip and includes one (1) 10 round Magpul PMAG. Proudly manufactured and assembled at the IWI US facility in Middletown Pennsylvania. - Caliber: 5.56 NATO - Action: Semi-auto - Operating System: Direct Impingement - Magazine Type: Polymer NATO STANAG - Magazine Capacity: 10 Round - Barrel Material: 4150 Chrome Moly Vanadium HB - Barrel Length: 16 - Overall Length: 33 Stock Collapsed 36.25 Stock Extended - Weight: 6.5 lbs w/out Magazine - Gas Length: Mid-Length - Rifling: 6 RH Grooves 1:8 Twist - Stock Type: Adjustable B5