The perceived failure of the polymer frame type firearm is the exposure to ultraviolet light. There is some concern that UV / direct sunlight may cause chemical changes to the polymers. The manufactures add ingredients to strengthen it for these all day exposures. Still I wouldn't let it lay around in direct sunlight all the time if is mine. Carrying it inside a case is wise on the ATV / jeep etc. where all day 4x4 is the plan.