GC_UPC Daniel Defense MK18 RIII 5.56mm NATO Flat Dark Earth Upper Receiver Group 23-004-81721-011 MAP 23-004-81721-011 show more like this Free Shipping over $250 Eurooptic GC_UPC MK18 RIII URG 5.56MM 10.3" FDE $1,299.00 23-004-81721-011 show more like this 14.95 The Castle Arms GC_UPC Daniel Defense Upper Receiver with Flash Hider Assembly MK18 RIII URG, 5.56x45mm NATO, 19.3 inch, 10.3 inch Barrel, Government Profile, Carbine Length, 1-7 Twist, 1/2x28 Thread, M-LOK Handguard, Flash Suppressor, Salt Bath Nitride, FDE, 23-004-81721-011 $1,412.00 2300481721011 show more like this Dvor GC_UPC Daniel Defense AR-15 MK18 RIII Pistol Upper Receiver Assembly 5.56x45mm 10.3 Barrel - 748244" $1,412.00 23-004-81721-011 show more like this 14.25 MidwayUSA