The drop down action of the Omega will get a ton of blow back crud on it as well as the under side of the barrel and stock. I don't worry about it during hunting season but after alot of shooting or a rain storm you will want to pull the stock. When I pull it I lube everything really well with CLP. After about 50 shots you may want to clean the firing pin area...I took mine down after about 30 shots and it was perfectly clean.