{"product_id":"spikes-st-15-complete-ar-15-upper-5-56-nato-16-inch-cold-hammer-forged-barrel-free-float-rail-stu5435r2s","title":"Spikes ST-15 Complete AR-15 Upper 5.56 NATO 16 Inch Cold Hammer Forged Barrel Free Float Rail STU5435R2S","description":"\u003ch2\u003eProduct Description\u003c\/h2\u003e\u003cp\u003eThe Spikes ST-15 Complete Upper is a Mil-Spec compliant AR-15 upper assembly built for shooters who want dependable performance, durable materials, and a ready-to-install configuration. Chambered in 5.56x45mm NATO, this complete upper features a 16-inch cold hammer forged barrel with a black phosphate finish, a mid-length gas system, and a forged 7075-T6 aluminum receiver for strength and long service life. Its free-floating 12-inch handguard helps support consistent accuracy while providing ample space for accessories, and the included A2 flash hider delivers a proven muzzle setup. Designed to fit AR-15 platforms, this optic-ready upper is a strong choice for range use, training, and duty-style rifle builds.\u003c\/p\u003e\u003ch2\u003eProduct Highlights\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eComplete AR-15 upper assembly chambered in 5.56x45mm NATO for reliable performance and broad ammunition compatibility.\u003c\/li\u003e\n\u003cli\u003e16-inch cold hammer forged barrel with black phosphate finish and 1:7 twist rate for durability and stabilization of a wide range of bullet weights.\u003c\/li\u003e\n\u003cli\u003eMid-length gas system with micro or low-profile gas block configuration helps promote smooth cycling and balanced recoil impulse.\u003c\/li\u003e\n\u003cli\u003eForged 7075-T6 aluminum upper receiver provides lightweight strength for hard use and long-term durability.\u003c\/li\u003e\n\u003cli\u003e12-inch free-floating handguard and A2 flash hider create a practical, optic-ready setup for modern AR-15 builds.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecs\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eBrand: Spikes\u003c\/li\u003e\n\u003cli\u003eModel: ST-15 Complete Upper\u003c\/li\u003e\n\u003cli\u003eManufacturer Part Number: STU5435R2S\u003c\/li\u003e\n\u003cli\u003eUPC: 815648023331\u003c\/li\u003e\n\u003cli\u003eCaliber: 5.56x45mm NATO\u003c\/li\u003e\n\u003cli\u003eCompatible Platform: AR-15\u003c\/li\u003e\n\u003cli\u003eType: Complete Upper\u003c\/li\u003e\n\u003cli\u003eBarrel Length: 16 in\u003c\/li\u003e\n\u003cli\u003eBarrel Finish: Black Phosphate\u003c\/li\u003e\n\u003cli\u003eBarrel Construction: Cold hammer forged, Mil-Spec\u003c\/li\u003e\n\u003cli\u003eBarrel Profile: ST Optimum Profile\u003c\/li\u003e\n\u003cli\u003eTwist Rate: 1:7\u003c\/li\u003e\n\u003cli\u003eGas System: Mid-length\u003c\/li\u003e\n\u003cli\u003eGas Block: ST Micro Gas Block\u003c\/li\u003e\n\u003cli\u003eGas Seat Diameter: .750 in\u003c\/li\u003e\n\u003cli\u003eReceiver Material: 7075-T6 Aluminum\u003c\/li\u003e\n\u003cli\u003eReceiver Finish: Black\u003c\/li\u003e\n\u003cli\u003eHandguard: 12 in free-floating handguard\u003c\/li\u003e\n\u003cli\u003eMuzzle Device: A2 Flash Hider\u003c\/li\u003e\n\u003cli\u003eThread Pattern: 1\/2x28\u003c\/li\u003e\n\u003cli\u003eBolt Carrier Group: Spike's Tactical Mil-Spec M16 Bolt Carrier Group\u003c\/li\u003e\n\u003cli\u003eSights: Optic Ready\u003c\/li\u003e\n\u003cli\u003eWeight: 4 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.\u003c\/em\u003e\u003c\/p\u003e","brand":"Spikes","offers":[{"title":"Default Title","offer_id":44199313899642,"sku":"FLX-99748","price":782.98,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1679\/0365\/files\/e9a2cbf0b4b9fa9689b4d864e788dd30.png?v=1788272551","url":"https:\/\/tlooutdoors.com\/products\/spikes-st-15-complete-ar-15-upper-5-56-nato-16-inch-cold-hammer-forged-barrel-free-float-rail-stu5435r2s","provider":"TLO Outdoors","version":"1.0","type":"link"}