Luth-AR Slick Side A1 Stripped Upper Receiver .223 Remington/5.56mm 7.75in Hard Coat Anodized Black. Correct early-style carry handle contours with A1-pattern rear sight housing. The Slick-side Upper eliminates the shell deflector and forward assist. Dust cover charging handle and rear sight components sold separately. All points where other parts attach are finished current mil-spec dimensions. Current production AR-15 components will fit perfectly. Note that the AR-15 / M16 Slick-side Upper Receiver is period-accurate therefore it DOES NOT have M4-type feed ramps found on most current-production AR-15 flattop upper receivers. Specifications for Luth-AR Slick Side A1 Stripped Upper Receiver: Manufacturer: Luth-AR Color: Black Finish: Hardcoat Anodized Fabric/Material: 7075-T6 Aluminum Caliber: .223 Remington Gun Make: AR Platform Gun Model: AR-15 Condition: New Overall Length: 7.75 in Weight: 7 oz Height: 4 in Width: 1.5 in Features of Luth-AR Slick Side A1 Stripped Upper Receiver Does NOT have M-4 Feed Ramp No Shell Deflector No Forward Assist No Dust Cover Package Contents: Luth-AR Slick Side A1 Stripped Upper Receiver What firearm models does the manufacturer say Luth-AR Slick Side A1 Stripped Upper Receiver is compatible with? The manufacturer suggests that Luth-AR Slick Side A1 Stripped Upper Receiver is compatible with AR-15Luth-AR UR-01-E3-S: Slick Side A1 Stripped Upper Receiver .223 Remington/5.56mm 7.75in Hard Coat Anodized Black