What distinguishes the Mossberg 12-gauge model 590 shotgun from the model 500?

The distinguishing feature of the Mossberg 12-gauge model 590 shotgun in contrast to the model 500 is the detachable heat shield. The 590 is often designed with a heat shield that helps protect the shooter from the heat generated during sustained fire, particularly in combat or law enforcement scenarios. This feature is particularly beneficial for maintaining the shooter's comfort and safety, allowing for prolonged use without the risk of burns.

In contrast, the Mossberg model 500 typically does not come with a detachable heat shield, making this feature a significant differentiator. While other options such as recoil pads, adjustable sights, and extended magazines may be available on both models depending on their specific variants and configurations, the detachable heat shield is a unique characteristic that adds to the versatility and operational capability of the model 590.