YHM has long been a manufacturer of quality AR-15 Upper Receivers and is very proud to offer our A3 Upper Receivers laser marked with the caliber of the firearm. - These uppers were designed and are MACHINED 100% IN HOUSE - Made from 7075-T6 aluminum (Forged) - M4 Style feed ramps and T Markings - Inside coated with dry film lube - Accepts Standard upper receiver parts (dust covers forward assists etc.) - Accepts Mil-Spec Lower receivers - Fit and function with your standard lower receiver - Hardcoat Anodized matte black to Military Specifications or better - Features desired caliber marking engraved on the left side of the lower receiver - Marked YHM 300 BLK

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