{"product_id":"colt-m4-to-m5-pdw-upper-reciever-kit","title":"Colt M4 to M5 PDW Upper Reciever Kit","description":"\u003cp\u003e\u003cstrong\u003eClose quarters punish an upper that flexes when you hang real gear.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis kit converts a legacy M4 lower with a complete 5.56 NATO upper: 10.3-inch chrome-lined heavy barrel, free-floating M-LOK handguard, and a continuous MIL-STD-1913 top rail.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePerformance Under Pressure\u003c\/strong\u003e: Carbine-length direct impingement and a 1:7 twist keep the short rifle honest when you clear a hall and need the first round to land.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDurability and Reliability\u003c\/strong\u003e: A self-centering barrel nut and keyed barrel extension lock the heavy barrel so the group does not walk as the handguard takes lights and pressure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFriction Removal\u003c\/strong\u003e: The one-piece free-floating M-LOK handguard and continuous top rail let you hang optic, light, and sling without fighting clutter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIdentity Signal\u003c\/strong\u003e: An ambidextrous Radian Raptor charging handle and folding Troy metal sights mark a modernized M4, not a leftover carbine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProof and Credibility\u003c\/strong\u003e: This is a complete upper receiver conversion kit with a chrome-lined heavy barrel, improved barrel retention, and included sights and charging handle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConvert the lower you already run and shoot a shorter, stiffer upper.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Colt","offers":[{"title":"Default Title","offer_id":51719573930299,"sku":"CM556-10H-CK","price":1125.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0121\/1475\/5646\/files\/1214748_1.jpg?v=1789913115","url":"https:\/\/greatcallathletics.com\/products\/colt-m4-to-m5-pdw-upper-reciever-kit","provider":"Great Call Athletics","version":"1.0","type":"link"}