Home / Upper Parts / ARRGB-UH Railed Gas Block Upper Receiver Height ARRGB-UH Railed Gas Block Upper Receiver HeightMSRP $32.99 .750 Gas Block with Rail, Upper Receiver Height. Three Set Screws included MADE IN THE USA ARRGB-UH Railed Gas Block Upper Receiver Height quantity Add to cart UPC: '784682014608 Categories: AR Parts, Upper Parts Product ID: 743