{"product_id":"hk-mr556-a4-upper-receiver-223-remington-5-56-nato-16-5-barrel-threaded-1-2x28-m-lok-handguard","title":"HK MR556 A4 Complete Upper, 5.56 NATO \/ .223 Rem, 16.5\" (Color: Black)","description":"\u003cp\u003e\u003cstrong\u003eNot available for online purchase.\u003c\/strong\u003e Complete upper receivers are shown for reference only and cannot be ordered through this website.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: Heckler \u0026amp; Koch\u003c\/li\u003e\n\u003cli\u003eModel: MR556 A4 Upper Receiver\u003c\/li\u003e\n\u003cli\u003eManufacturer Part #: 51000384\u003c\/li\u003e\n\u003cli\u003eColor: Black\u003c\/li\u003e\n\u003cli\u003eShipping Weight: 10.00 lb\u003c\/li\u003e\n\u003cli\u003eUPC: 642230270213\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e223 Remington\/5.56 NATO\u003c\/li\u003e\n\u003cli\u003e16.5\" Barrel\u003c\/li\u003e\n\u003cli\u003eThreaded 1\/2X28\u003c\/li\u003e\n\u003cli\u003eM-LOK Handguard\u003c\/li\u003e\n\u003cli\u003eAnodized Finish\u003c\/li\u003e\n\u003cli\u003eFits AR-15 Lower Receivers\u003c\/li\u003e\n\u003cli\u003eIncludes Bolt Carrier Group\u003c\/li\u003e\n\u003cli\u003eCharging Handle\u003c\/li\u003e\n\u003cli\u003eBuffer Weight and Buffer Spring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eShips directly from our U.S. distribution partner, separately from any airsoft items in your order.\u003c\/li\u003e\n\u003cli\u003eShipping restrictions apply to: CA, CT, IL, NJ, WA.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e This product can expose you to chemicals which are known to the State of California to cause cancer and\/or birth defects or other reproductive harm. For more information go to \u003ca href=\"https:\/\/www.P65Warnings.ca.gov\" target=\"_blank\" rel=\"noopener\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e.\u003c\/p\u003e","brand":"Heckler \u0026 Koch","offers":[{"title":"Default Title","offer_id":67602993873120,"sku":"HK51000384","price":2179.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/0420\/1952\/files\/HK51000384_1_HR.jpg?v=1790566034","url":"https:\/\/modifiedmilsim.com\/products\/hk-mr556-a4-upper-receiver-223-remington-5-56-nato-16-5-barrel-threaded-1-2x28-m-lok-handguard","provider":"Modified Milsim","version":"1.0","type":"link"}