All come in an array of stocks, barrels, finishes and combo options that make it the perfect, versatile choice from first time hunters to seasoned veterans alike. The venerable 500 pump action is offered in an incredibly diverse variety of field, waterfowl, turkey, slug, muzzleloading and combo configurations. Lightning Pump Action (LPA) Adjustable Trigger System available on select 500 Turkey, Slugster and Combo Models.