{"product_id":"colt-m4-to-m5-carbine-upper-reciever-kit-5-56-nato-14-5-in-heavy-barrel-black","title":"Colt M4 to M5 Carbine Upper Reciever Kit 5.56 Nato 14.5 in. Heavy Barrel Black","description":"\u003cp\u003eThe Colt M4 to M5 Carbine Upper Receiver Kit upgrades a legacy M4 platform with a complete 5.56 NATO upper receiver assembly featuring a 14.5-inch free-float heavy barrel. The M5 upper incorporates a one-piece M-LOK compatible handguard with a continuous MIL-STD-1913 top rail and an improved barrel retention interface for enhanced rigidity and accuracy. The kit includes an ambidextrous charging handle and folding iron sights, providing a modernized upper assembly that installs on compatible lower receivers.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eComplete upper receiver conversion kit\u003c\/li\u003e\n\u003cli\u003eCaliber: 5.56 NATO\u003c\/li\u003e\n\u003cli\u003eBarrel Length: 14.5\"\u003c\/li\u003e\n\u003cli\u003eFree-float heavy barrel\u003c\/li\u003e\n\u003cli\u003eChrome-lined barrel\u003c\/li\u003e\n\u003cli\u003e1:7 twist rate\u003c\/li\u003e\n\u003cli\u003eDirect impingement gas system\u003c\/li\u003e\n\u003cli\u003eCarbine-length gas system\u003c\/li\u003e\n\u003cli\u003eOne-piece M-LOK free-floating handguard\u003c\/li\u003e\n\u003cli\u003eContinuous MIL-STD-1913 top rail\u003c\/li\u003e\n\u003cli\u003eImproved barrel retention interface\u003c\/li\u003e\n\u003cli\u003eSelf-centering barrel nut and keyed barrel extension\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Colt","offers":[{"title":"Default Title","offer_id":67835027620064,"sku":"1214750","price":925.06,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/7559\/8560\/files\/1214750_1.jpg?v=1791568367","url":"https:\/\/redbayououtdoorsupply.com\/products\/colt-m4-to-m5-carbine-upper-reciever-kit-5-56-nato-14-5-in-heavy-barrel-black","provider":"Red Bayou Outdoor Supply","version":"1.0","type":"link"}