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Q&A · Hunting

Why do certain states have restrictions on pump shotgun modifications?

April 5, 2026

Quick Answer

Certain states restrict pump shotgun modifications to prevent them from being used as semi-automatic shotguns, which are prohibited for hunting waterfowl. This is typically achieved by limiting the number of shells that can be loaded or requiring a specific type of stock. These regulations aim to enforce federal and state laws regulating waterfowl hunting.

Understanding Shotgun Modifications

To comply with regulations, it’s essential to understand the different types of pump shotgun modifications. One common restriction is the requirement for a “piston-operated” or “pump-action” design, which limits the shotgun to 3 or 4 shots. For example, in California, shotguns must have a 3-shot capacity, while in Oregon, it’s 4 shots.

Compliance with Regulations

To ensure compliance, hunters should pay attention to the specific regulations in their state. In the United States, the Federal Migratory Bird Treaty Act regulates waterfowl hunting, and each state has its own set of regulations. For example, in some states, shotguns must have a “plug” or a “block” installed to prevent loading more than 3 shells. Hunters should familiarize themselves with these regulations to avoid penalties or fines.

Stock and Choke Considerations

Another aspect of pump shotgun modifications is the stock and choke. Some states require shotguns to have a specific type of stock, such as a “plain” or “standard” stock, to distinguish them from semi-automatic shotguns. Chokes can also be a point of contention, as some states restrict the use of certain types of chokes, such as those with adjustable constrictions. Hunters should check with their state’s wildlife agency to determine the specific requirements for their shotgun.

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