Magblocks are designed to help you to comply with magazine restrictions and laws and for hunting or sporting uses only. Please be aware of the law in your area. Fitting may be required on some products due to variations between magazine manufactures, product lines, and changes in magazine design and materials. Please test your magazines during installation to be positive that the desired round count is achieved and modify as needed before use. Firearm laws are subject to frequent change and court interpretation. This summary is not intended as legal advice or restatement of law. This summary does not include all federal or local laws, ordinances or regulations. For any particular situation, a licensed local attorney must be consulted for an accurate interpretation. You must abide by all laws: State, Federal and Local. More info can be found at: http://www.magazineblocks.com/magento/faq