M4E1 Threaded 20" Complete Upper Receiver w/ ATLAS S-ONE Handguard FDE CALIFORNIA LEGAL - .223/5.56

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M4E1 Threaded Upper Receiver Features: New enhanced forging that gives the upper receiver a "billet look" New picatinny profile that blends seamlessly with our Enhanced Series Handguards M4 Feedramps .250 takedown pin holes Laser engraved T-marks Includes port door and forward assist installed ATLAS S-ONE Handguard Features: Front and rear picatinny rail Eliminated center of top rail for weight reduction Indexing grooves in 12:00 position for positive grip control Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Compatible with low profile gas blocks 1.3” Inside diameter 1.5” Outside diameter Compatible with mil-spec AR15 upper receivers and barrels Learn More about our NEW ATLAS S-ONE Hanguards 20" 5.56 Rifle Length CMV Barrel Features: 5.56 NATO 20" Rifle Length, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled .750 gas block journal Government Profile Rifle length gas system, .0785 gas port M4 Feed Ramp Extension HP and MPI tested Standard A2 flash hider MORE INFORMATION More Information Shipping to FFL Dealer Required No Made In America Yes Platform AR15 Complete Upper Series ATLAS Caliber 5.56 NATO Barrel Length 20 Weight (oz) 61 oz Other NOTE: Weights above include Gen 2 Upper, Handguard, Barrel, Muzzle Brake and Mounting Hardware.