For the price, the factory set is hard to beat. Here's what I did. Bought a synthetic 500 (factory drilled for GR sight) with 28" VR barrel off of Gunbroker for $125 + shipping/transfer. Bought a 18.5" barrel with front sight installed & rear GR set from Mossberg, all for about $125. Now I have the GR setup and an extra barrel and didn't have to do any gunsmithing (drilling, soldering, etc).