Caliber: 5.56 NATO. First M4 variant rifle from IWI US. Barrel: 16” 4150 Chrome Moly Vanadium HB, 1:8 twist, 6 RH grooves. Gas System: Mid-length direct impingement. Overall Length: 33”-36.25”. Weight: 6.9 lbs. without magazine. 15” free-float handguard, B5 Systems Stock and Grip. One 30-round Magpul PMAG. Manufactured and assembled at the IWI US facility in Middletown, Pennsylvania. Introduced 2020. Special Purpose Rifle (SPR) introduced 2024 with an 18” barrel, rifle-length gas system. 7.6 lbs. Add 53% for the SPR variant.