Upgraded internals like inner barrel and hopup assembly. Bolt catch mod. Stronger buffer spring. Metal buffer tube catch. 4 non leaky mags Magpul vertical fore-grip Aftermarket flash hider Magpul pistol grip Paracorded Defiance TR110 Rail Only scratches (which can be seen in the pictures) are on the receiver only. Everything else is practically scratch-free 350 shiped obo