Hey everyone I am looking for an upper to put on my Yankee hill lower receiver. and I found one made by JSE surplus. The thing is I don't know much about this company so any input or experience you guys have had dealing with them would be great. here are the specs on the upper I want to purchase from them Thanks. Complete AR-15 Upper Receiver with a 16" Nitride Coated M4 barrel, "F" front sight. Features an A3 flat top upper receiver with "T" marked rails, dust cover, brass deflector, and forward assist. CAR-15 handguards and "F" marked front sight base with bayonet lug. No rear sight included. 5.56 NATO chambered government profile 16" barrel with A2 flash hider, 1x7" twist, M4 feed ramps, M4 notch. Barrel is nitride treated for superior hardness and corrosion resistance. Upper comes complete with bolt, carrier, and charging handle.