{"product_id":"smith-wesson-mp-40-shield-locking-block-40sw-used-40s6","title":"Smith \u0026 Wesson M\u0026P 40 Shield Locking Block .40 S\u0026W Used Part 40S6","description":"\u003ch2\u003eSmith \u0026amp; Wesson M\u0026amp;P 40 Shield Locking Block — .40 S\u0026amp;W | Part #40S6\u003c\/h2\u003e\u003cp\u003eThis listing is for a \u003cstrong\u003egenuine Smith \u0026amp; Wesson factory locking block\u003c\/strong\u003e for the M\u0026amp;P 40 Shield chambered in .40 S\u0026amp;W. This is a used OEM part in good working condition — a cost-effective solution for gunsmiths and owners needing a reliable replacement without paying new part prices.\u003c\/p\u003e\u003cp\u003eThe locking block is a critical fire control component that locks the barrel into battery during firing. Replacing a worn or damaged locking block restores proper function and maintains factory tolerances.\u003c\/p\u003e\u003ch3\u003ePart Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 40S6\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Used — good working condition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM:\u003c\/strong\u003e Genuine Smith \u0026amp; Wesson factory part\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber:\u003c\/strong\u003e .40 S\u0026amp;W\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eModel Compatibility\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eGeneration\u003c\/th\u003e\n\u003cth\u003eCaliber\u003c\/th\u003e\n\u003cth\u003eCompatible\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eM\u0026amp;P 40 Shield\u003c\/td\u003e\n\u003ctd\u003e1.0\u003c\/td\u003e\n\u003ctd\u003e.40 S\u0026amp;W\u003c\/td\u003e\n\u003ctd\u003e✓ Yes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eM\u0026amp;P 40 Shield\u003c\/td\u003e\n\u003ctd\u003e2.0\u003c\/td\u003e\n\u003ctd\u003e.40 S\u0026amp;W\u003c\/td\u003e\n\u003ctd\u003eVerify fitment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eNote: Not compatible with M\u0026amp;P 40 full-size, M\u0026amp;P 40 Compact, M\u0026amp;P 40 Shield EZ, or M\u0026amp;P 40 Shield Plus. Shield-specific part only.\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGunsmith installation recommended\u003c\/li\u003e\n\u003cli\u003eFull disassembly required for replacement\u003c\/li\u003e\n\u003cli\u003eMay require fitting by a qualified gunsmith\u003c\/li\u003e\n\u003cli\u003eManufactured to exact factory specifications\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eQuestions?\u003c\/strong\u003e Contact our firearms parts experts at \u003ca href=\"mailto:sales@usagunsandgear.com\"\u003esales@usagunsandgear.com\u003c\/a\u003e or call \u003ca href=\"tel:7705448075\"\u003e770-544-8075\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eNo shipping outside the U.S.\u003c\/em\u003e\u003c\/p\u003e","brand":"Smith \u0026 Wesson","offers":[{"title":"Default Title","offer_id":41063643775034,"sku":"40S6","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1423\/2020\/files\/DSC08940_9e0b02d0-4ea7-419f-92d4-75312482d4d6.jpg?v=1760982025","url":"https:\/\/usagunsandgear.com\/products\/smith-wesson-mp-40-shield-locking-block-40sw-used-40s6","provider":"USA Guns And Gear","version":"1.0","type":"link"}