{"product_id":"lantac-rps-end-plate-castle-nut","title":"LanTac USA LLC RPS End Plate \u0026 Castle Nut – AR-15\/AR-10","description":"\u003cp\u003eThe LanTac RPS (Ratchet Plate System) End Plate \u0026amp; Castle Nut replaces the standard AR-pattern buffer tube retention components with a tool-free, anti-rotation system. Designed for shooters who frequently change stocks or need a secure, repeatable lockup without staking, the RPS uses an integrated ratchet mechanism that locks the castle nut in place without requiring a wrench or punch. This eliminates the need for traditional staking while maintaining a positive, zero-movement connection between the lower receiver and buffer tube.\u003c\/p\u003e\u003cp\u003eMachined from steel with a manganese phosphate finish for corrosion resistance, the RPS installs without specialized tools—finger-tight engagement is sufficient, though an armorer's wrench can be used for initial setup. The end plate features a low-profile design and a standard sling attachment point. This is a drop-in component for builders and armorers seeking a clean, repeatable buffer tube installation method.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Buffer Tube End Plate \u0026amp; Castle Nut\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Firearms:\u003c\/strong\u003e AR-15, AR-10, and AR-pattern rifles\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Manganese Phosphate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Drop-In (armorer's wrench optional)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e RPS End Plate, RPS Castle Nut\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"LanTac USA LLC","offers":[{"title":"Default Title","offer_id":47943841480959,"sku":"LAN01UPRPS","price":55.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/0434\/3807\/files\/2146816.jpg?v=1766603370","url":"https:\/\/doublestackstore.com\/products\/lantac-rps-end-plate-castle-nut","provider":"Double Stack Store","version":"1.0","type":"link"}