{"product_id":"agency-mag-ext-sig-p320-17rd-5-blk","title":"Agency Arms Magazine Extension for SIG P320 17-Round +5 – Black","description":"\u003cp\u003eThe Agency Arms Magazine Extension increases capacity of factory SIG P320 17-round magazines by five rounds, bringing total capacity to 22 rounds. Designed for shooters who want extended capacity without switching to a larger grip module, this extension maintains a clean profile while adding meaningful round count for competition, duty, or home defense applications.\u003c\/p\u003e\u003cp\u003eMachined from billet aluminum with a Type III hard-anodized black finish for corrosion resistance and durability. Installation requires disassembly of the factory magazine baseplate and replacement with the Agency extension and included spring. The extension adds minimal length to the magazine while preserving reliable feeding. Some fitting or adjustment of the spring may be required depending on magazine generation and condition.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Magazine Extension\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e SIG P320 (17-round factory magazines)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacity Increase:\u003c\/strong\u003e +5 rounds (17rd to 22rd total)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Billet Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Type III Hard Anodized, Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e User-installable with basic tools; gunsmithing not required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e Magazine extension, spring\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Agency Arms","offers":[{"title":"Default Title","offer_id":47943560528127,"sku":"AGEBP-320-BLK","price":65.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/2853640.jpg?v=1766585478","url":"https:\/\/doublestackstore.com\/products\/agency-mag-ext-sig-p320-17rd-5-blk","provider":"Double Stack Store","version":"1.0","type":"link"}