--- title: "AERO PRECISION M4E1 PRO Complete Upper 5.56 NATO 16.3\" / 15\" ATLAS R-ONE Handguard - Black" canonical_url: "https://www.kygunco.com/product/aero-precision-apug700705m105-1-m4e1-threaded-pro-complete-upper-w-16.3-5.56-chf" meta: author: KYGUNCO "og:image": "https://cdn.kygunco.com/assets/products/226523/thumbnail.jpg?v=1713193084" "og:image:height": "500" "og:image:width": "500" "og:title": "AERO PRECISION M4E1 PRO Complete Upper 5.56 NATO 16.3\" / 15\" ATLAS R-ONE Handguard - Black" --- > 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) / RPR-APUG700705M105-1 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/226523/main.jpg?v=1713193084) For illustration purposes only, this image may not be an exact representation of the product. # AERO PRECISION M4E1 PRO Complete Upper 5.56 NATO 16.3" / 15" ATLAS R-ONE Handguard - Black See Price In Cart ** 5 interest-free payments of **$190** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) As low as **$169.60**/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 Handled by our expert shippers in Bardstown, KY. Item # 226523 Style RPR-APUG700705M105-1 UPC 840014620234 Condition New Manufacturer [Aero Precision](https://www.kygunco.com/brand/aero-precision) The PRO Upper Receiver Group built around our PRO 5.56 Cold Hammer Forged Barrel that is paired with our PRO 5.56 BCG. Included ATLAS R-ONE Handguard, BREACH Charging Handle, and VG6 Delta muzzle device round this assembly out into a premium turnkey solution for your next build. Cold hammer forging differs from other common barrel manufacturing processes. Rather than drilling a blank and using cutters, buttons, and reamers to machine the chamber and rifling into the barrel, a cold hammer forged barrel is made by forming the barrel around a mandrel that has the rifling inclusions precision ground into it. This process is referred to as "cold" hammer forging because the process is done at room temperature and the metal is not heated. 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. **SPECIFICATIONS** - 16.3" PRO 5.56 Cold Hammer Forged Barrel - PRO 5.56 Bolt Carrier Group - M4E1 Threaded Upper Receiver - ATLAS R-ONE Handguard - VG6 Delta Flash Hider - Mid-Length Gas System - AR15 BREACH® Ambi Charging Handle w/ Large Lever - Black - Series M4E1 - Caliber 5.56 NATO - Barrel Length 16.3" - Select Your Finish Anodized Black - Weight(s) 3 lbs 15.7 oz ** 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). 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## More from Aero Precision ```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/aero-precision-apug700705m105-1-m4e1-threaded-pro-complete-upper-w-16.3-5.56-chf#webpage","@type":"WebPage","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"AERO PRECISION M4E1 PRO Complete Upper 5.56 NATO 16.3\" / 15\" ATLAS R-ONE Handguard - Black","url":"https://www.kygunco.com/product/aero-precision-apug700705m105-1-m4e1-threaded-pro-complete-upper-w-16.3-5.56-chf","about":{"@id":"https://www.kygunco.com/product/aero-precision-apug700705m105-1-m4e1-threaded-pro-complete-upper-w-16.3-5.56-chf#/schema//kygunco"},"breadcrumb":{"@id":"https://www.kygunco.com/product/aero-precision-apug700705m105-1-m4e1-threaded-pro-complete-upper-w-16.3-5.56-chf#breadcrumb"},"isPartOf":{"@id":"https://www.kygunco.com/#website"},"potentialAction":[{"@type":"ReadAction","target":["https://www.kygunco.com/product/aero-precision-apug700705m105-1-m4e1-threaded-pro-complete-upper-w-16.3-5.56-chf"]}]},{"@id":"https://www.kygunco.com/#/schema/organization/kygunco","alternateName":"Kentucky Gun Company","currenciesAccepted":"USD","description":"Shop KYGUNCO for firearms, ammo, gun parts, optics, shooting accessories, and outdoor gear with online ordering and shipping options across the U.S.","email":"info@kygunco.com","foundingDate":"1946-01-01","hasMap":"https://www.google.com/maps/dir/?q=place_id:ChIJfwecWCBSaIgRguIjuoPha40","logo":"https://www.kygunco.com/logos/kygunco.svg","name":"KYGUNCO","priceRange":"$$","telephone":"+1-502-348-3594","url":"https://www.kygunco.com","@type":["Organization","LocalBusiness"],"address":{"@type":"PostalAddress","streetAddress":"401 Glenwood Drive","addressLocality":"Bardstown","addressRegion":"KY","postalCode":"40004","addressCountry":"US"},"contactPoint":{"@type":"ContactPoint","contactType":"Customer Service","telephone":"+1-502-348-3594","email":"info@kygunco.com","availableLanguage":"English","hoursAvailable":{"@type":"OpeningHoursSpecification","dayOfWeek":["https://schema.org/Monday","https://schema.org/Tuesday","https://schema.org/Wednesday","https://schema.org/Thursday","https://schema.org/Friday"],"opens":"09:00","closes":"17:00"}},"geo":{"@type":"GeoCoordinates","latitude":37.8032518,"longitude":-85.4252895},"hasMerchantReturnPolicy":{"@type":"MerchantReturnPolicy","name":"Standard Return Policy","inStoreReturnsOffered":true,"merchantReturnDays":30,"returnPolicyCategory":"https://schema.org/MerchantReturnFiniteReturnWindow","returnMethod":["https://schema.org/ReturnByMail","https://schema.org/ReturnInStore"],"returnFees":"https://schema.org/FreeReturn","refundType":["https://schema.org/ExchangeRefund","https://schema.org/FullRefund","https://schema.org/StoreCreditRefund"],"applicableCountry":"US"},"hasOfferCatalog":{"@type":"OfferCatalog","name":"KYGUNCO Catalog","url":"https://www.kygunco.com/search"},"image":{"@id":"https://www.kygunco.com/#/schema/image/1"},"knowsAbout":["Firearms sales and transfers","FFL dealers and compliance","Optics and accessories","Outdoor and hunting equipment"],"openingHoursSpecification":[{"@type":"OpeningHoursSpecification","dayOfWeek":["https://schema.org/Monday","https://schema.org/Tuesday","https://schema.org/Wednesday","https://schema.org/Thursday","https://schema.org/Friday","https://schema.org/Saturday"],"opens":"09:00","closes":"18:00"}],"paymentAccepted":["Credit Card","Credova","Sezzle"],"sameAs":["https://x.com/kygunco","https://www.facebook.com/kentuckygunco","https://www.instagram.com/kygunco","https://www.youtube.com/@thekentuckygunco","https://rumble.com/c/KYGUNCO"]},{"@id":"https://www.kygunco.com/product/aero-precision-apug700705m105-1-m4e1-threaded-pro-complete-upper-w-16.3-5.56-chf#product","@type":"Product","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","gtin":"840014620234","mpn":"APUG700705M105-1","name":"AERO PRECISION M4E1 PRO Complete Upper 5.56 NATO 16.3\" / 15\" ATLAS R-ONE Handguard - 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