Luth-AR A3 Parts Kit - Upper Receiver. 6 oz Condition: New Features of Luth-AR A3 Upper Receiver Parts Kit: Shipping Weight .5 lbs Shipping Dimensions 4 x 3 x .5 in Weight Ounce 1.6 Weight lbs .1 UPC Code 859819007942 Package Contents: Luth-AR A3 Upper Receiver Parts Kit UR-02 Ejection Hinge Pin Snap Ring 1 ea. UR-03 Ejection Port Cover Pin 1 ea. UR-04 Ejection Port Cover 1 ea. UR-05 Ejection Port Cover Spring 1 ea. UR-06 Forward Assist Pin 1 ea. UR-07 Forward Assist Spring 1 ea. UR-08-RA Forward Assist Button 1 ea. What firearm models does the manufacturer say Luth-AR A3 Upper Receiver Parts Kit is compatible with? The manufacturer says that Luth-AR A3 Upper Receiver Parts Kit is compatible with AR-15Luth-AR URPK-A3: A3 Parts Kit - Upper Receiver