The two things these guns need most is a hardened firing pin (Henning or EGW) and a hardened sear properly fitted to the gun. The hammers are fine out of the box with a little tweaking if you want the trigger really nice, or not if you don't care. The stock sears are surface hardened, and some are better than others. If you get a good one, it can last a long time, but if not you will have to replace it. Not a big deal though, and the EGW will last forever. The rest of the after market goodies are very nice but not necessary, though most people will benefit from aluminum grips as the standard wood grip panels look really nice but are too large for most hands.