--- title: "Panzer AR57 12\" Complete Upper 50rd" description: "12\" 5.7x28 upper receiver with 50rd top-feed magazine. Converts AR-15 lowers into low-recoil, high-capacity rifles using the AR57 system." canonical_url: "https://www.kygunco.com/product/ar57-ar57ult-12-ult-5.7x28-12-upper-w-50rd-mag" meta: author: KYGUNCO "og:description": "12\" 5.7x28 upper receiver with 50rd top-feed magazine. Converts AR-15 lowers into low-recoil, high-capacity rifles using the AR57 system." "og:image": "https://cdn.kygunco.com/assets/products/247149/thumbnail.jpg?v=1713457247" "og:image:height": "500" "og:image:width": "500" "og:title": "Panzer AR57 12\" Complete Upper 50rd" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Shooting](https://www.kygunco.com/category/shooting) / [Gun Parts](https://www.kygunco.com/category/shooting/gun-parts) / [Handgun & Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts) / [Rifle Parts](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts) / [Upper Receivers](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts/upper-receivers) / PNZ-AR57ULT-12 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/247149/main.jpg?v=1713457247) For illustration purposes only, this image may not be an exact representation of the product. # Panzer Arms AR57 ULT 5.7x28 12" Complete Upper with 50rd Magazine The Panzer Arms AR57 ULT 12 inch Complete Upper converts a standard AR style lower into a compact 5.7x28 platform. It includes the bolt carrier group and a 50rd top feed magazine, with downward ejection through the magwell. The 12 inch barrel and lightweight receiver make it well suited for a compact, smooth shooting 5.7 configuration. 5.0 ** ** ** ** ** [1 review](#reviews) $711.85 ** 5 interest-free payments of **$142.37** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) As low as **$127.08**/month with ![Credova text logo](https://www.kygunco.com/brands/credova-text.svg) ** Online In Store ** Flat Rate $13.94 for every 25 lbs. Shipping to HI & AK may incur additional fees. ** Ships To Your Home Fulfilled by a partner warehouse. ** Partner Fulfilled Selling fast. Limited quantities available. Item # 247149 Style PNZ-AR57ULT-12 UPC 051497388553 Condition New Manufacturer [Panzer Arms](https://www.kygunco.com/brand/panzer-arms) Round Capacity 50 Caliber 5.7x28mm Shop with KYGUNCO for the best selection, competitive pricing, and exceptional customer service. Experience the difference that comes with buying from a trusted outdoor retailer with over 20 years of experience in the industry. - Caliber/Gauge 5.7x28 - Barrel Length 12" - Barrel Twist 1:9 - Barrel Bore Type Fully Rifled - Firearm Fit AR-15 ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 5.0 ** ** ** ** ** 1 review ** ** ** ** ** 1 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## Reviews ** Wilfred WEST PALM BEACH, FL Fast shipping with tracking, good price. Product was great and happy with my purchase. I would do business again. Great company and Fast shipping. 11/13/2025 ** ** ** ** ** ## More from Panzer Arms ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/ar57-ar57ult-12-ult-5.7x28-12-upper-w-50rd-mag#webpage","@type":"WebPage","description":"12\" 5.7x28 upper receiver with 50rd top-feed magazine. 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