The Colt M4 Carbine OEM1 Rifle is a semi-automatic, direct gas impingement rifle chambered in 5.56mm NATO, factory-configured as a stripped "builder's canvas" that lets enthusiasts choose their own custom handguards and stocks right out of the box. This duty-grade foundation incorporates a 16.1-inch chrome-lined, button-rifled barrel with a 1:7" right-hand twist rate and a standard A2 flash hider, built onto mil-spec forged 7075-T6 aluminum upper and lower receivers finished in a matte black Type III hardcoat anodizing. Operating on a reliable carbine-length gas system, it comes pre-installed with a traditional milestone-correct fixed A-frame front sight tower rather than a low-profile block, making it ideal for standard drop-in handguards or free-float rails designed to clear the fixed front sight. To reduce consumer cost and prevent wasted factory parts, this specific SKU ships entirely devoid of a handguard, buttstock, or trigger guard, while retaining a standard single-stage trigger, an A2 pistol grip, a mil-spec receiver extension (buffer tube), and an optics-ready flat-top Picatinny upper rail. The rifle is fully compatible with all standard AR-15 / STANAG magazines. Colt M4 Carbine OEM 5.56mm 16.1" Bbl Semi-Auto Fixed Front Sight Matte Black Rifle No Buttstock/Trigger Guard/Handguard LE6920-OEM1