--- title: "RUGER AR-556 MPR 450 BUSHMASTER 18.63\" 5rd Semi-Auto AR15 Rifle - M-LOK - Black" canonical_url: "https://www.kygunco.com/product/137255" meta: author: KYGUNCO "og:image": "https://cdn.kygunco.com/assets/products/137255/thumbnail.jpg?v=1712593094" "og:image:height": "500" "og:image:width": "500" "og:title": "RUGER AR-556 MPR 450 BUSHMASTER 18.63\" 5rd Semi-Auto AR15 Rifle - M-LOK - 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) / [Guns](https://www.kygunco.com/category/shooting/guns) / [Rifles](https://www.kygunco.com/category/shooting/guns/rifles) / [Semi-Auto](https://www.kygunco.com/category/shooting/guns/rifles/semi-auto) / RGR-08522 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/137255/main.jpg?v=1712593094) For illustration purposes only, this image may not be an exact representation of the product. # RUGER AR-556 MPR 450 BUSHMASTER 18.63" 5rd Semi-Auto AR15 Rifle - M-LOK - Black $997.99 ** 5 interest-free payments of **$199.60** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) As low as **$122.27**/month with ![Credova text logo](https://www.kygunco.com/brands/credova-text.svg) ** Online In Store ** Free Shipping Enjoy delivery to the Lower 48 States at no cost. ** Ships To FFL Dealer Handled by our expert shippers in Bardstown, KY. ** Check Local Restrictions Not sure whether this item can be shipped to your area? Enter your ZIP code for a quick check. Item # 137255 Style RGR-08522 UPC 736676085224 Condition New Manufacturer [Ruger](https://www.kygunco.com/brand/ruger) Model AR-556 Hand Right Hand Finish Black Round Capacity 5 Caliber 450 Bushmaster Action Semi-Auto Barrel Length 18.6 in - Lower receiver is fitted with Magpul® MOE® grip and MOE SL™ collapsible buttstock on the Mil-Spec buffer tube. - Handguard is free-floating for accuracy and the slim, 15" length provides enhanced ergonomics and support. - Flattop upper receiver includes an enlarged window for easy ejection as well as forward assist, dust cover and brass deflector. CNC-machined from Mil-Spec forging and Type III hard coat anodized for maximum durability. - Bolt is machined from high-strength superalloy, more than 50% stronger than traditional MSR bolt materials, and engineered with tapered lugs to support the large case head of .450 Bushmaster ammunition. - The Ruger® Elite 452™ AR-Trigger is a two-stage trigger that offers a smooth, crisp, 4.5 pound trigger pull. It features a full-strength hammer spring for consistent primer ignition and a lightweight hammer that enables a 30% faster lock time over standard MSR triggers. - Carbine-length gas system provides the most reliable function with .450 Bushmaster ammunition. - Magpul® M-LOK® accessory attachment slots along the 3:00, 6:00 and 9:00 positions with additional slots on the angled faces near the muzzle. - Cold hammer-forged 4140 chrome-moly steel barrel with ultra-precise 5R rifling and black nitrided finish provides exceptional accuracy, longevity and easy cleaning. The 1:16" twist rate maximizes accuracy with bullets ranging from 170 to 260 grains. - Chrome-plated bolt carrier inside diameter and chrome-plated gas key inside diameter provide exceptional resistance to hot gases. The gas key is staked so that it will not loosen after extensive firing. - Ruger® muzzle brake is a radial port design that significantly reduces felt recoil and muzzle movement. The 11/16"-24 threaded barrel allows for standard muzzle accessories to be installed. - Also includes: One, 5-round metal box magazine. **Specifications** **Model Number:** 8522 **Caliber:** 450 Bushmaster **Stock:** Black Synthetic, Collapsible **Handguard:** Free-Float M-LOK® **Sights:** None **Barrel Length:** 18.63" **Thread Pattern:** 11/16"-24 **Twist:** 1:16" RH **Capacity:** 5 **Finish:** Type III Hard Coat Anodized **Height:** 7.30" **Weight:** 7.4 lb. **Overall Length:** 35.60" - 38.90" **Length of Pull:** 11.10" - 14.40" **Grooves:** 5 ** 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). ## Frequently Bought Together 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## Don't Forget Your Ammo ```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/ruger-8522-ar-556r-mpr-450-bushmaster-18.63-51#webpage","@type":"WebPage","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"RUGER AR-556 MPR 450 BUSHMASTER 18.63\" 5rd Semi-Auto AR15 Rifle - M-LOK - Black","url":"https://www.kygunco.com/product/ruger-8522-ar-556r-mpr-450-bushmaster-18.63-51","about":{"@id":"https://www.kygunco.com/product/ruger-8522-ar-556r-mpr-450-bushmaster-18.63-51#/schema//kygunco"},"breadcrumb":{"@id":"https://www.kygunco.com/product/ruger-8522-ar-556r-mpr-450-bushmaster-18.63-51#breadcrumb"},"isPartOf":{"@id":"https://www.kygunco.com/#website"},"potentialAction":[{"@type":"ReadAction","target":["https://www.kygunco.com/product/ruger-8522-ar-556r-mpr-450-bushmaster-18.63-51"]}]},{"@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/ruger-8522-ar-556r-mpr-450-bushmaster-18.63-51#product","@type":"Product","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","gtin":"736676085224","mpn":"08522","name":"RUGER AR-556 MPR 450 BUSHMASTER 18.63\" 5rd Semi-Auto AR15 Rifle - 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