--- title: "Knights Armament 5.56 NATO QDC/CRS-PRT Suppressor" description: "Black 5.56 NATO suppressor with Pressure Reduction Technology, QDC mounting, 6.25\" overall length, 19.2 oz weight, and 24 dB sound reduction." canonical_url: "https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black" meta: author: KYGUNCO "og:description": "Black 5.56 NATO suppressor with Pressure Reduction Technology, QDC mounting, 6.25\" overall length, 19.2 oz weight, and 24 dB sound reduction." "og:image": "https://cdn.kygunco.com/assets/products/234659/thumbnail.jpg?v=1712147221" "og:image:height": "500" "og:image:width": "500" "og:title": "Knights Armament 5.56 NATO QDC/CRS-PRT Suppressor" --- > 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) / [Class III](https://www.kygunco.com/category/shooting/guns/class-iii) / [Suppressors](https://www.kygunco.com/category/shooting/guns/class-iii/suppressors) / KNG-121567-BLK ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/234659/main.jpg?v=1712147221) For illustration purposes only, this image may not be an exact representation of the product. # KNIGHTS ARMAMENT 5.56 NATO QDC/CRS-PRT 6.25" Silencer / Suppressor | Black The Knights Armament 5.56 NATO QDC/CRS-PRT is a black suppressor featuring Pressure Reduction Technology and a Quick Disconnect mounting system for 5.56 QDC muzzle devices. It measures 6.25" overall, weighs 19.2 oz, and provides a listed 24 dB sound reduction. $1,246.88 ** 5 interest-free payments of **$249.38** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** Online In Store ** Free Shipping Enjoy delivery to the Lower 48 States at no cost. ** NFA / Class 3 NFA transfer requirements vary by product and location. Additional documentation, approvals, or a qualified dealer may be required. Check local and state regulations to ensure eligibility and compliance before purchasing. ** 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 # 234659 Style KNG-121567-BLK UPC 819064018667 Condition New Manufacturer [Knights Armament](https://www.kygunco.com/brand/knights-armament) Model 556 CRS Finish Black Caliber 5.56 NATO, 223 Rem Weight 1 lb Action Silencer KAC’s Pressure Reduction Technology (PRT) Signature Reduction Device line blends the proven durability and acoustic performance of the previous generation of KAC suppressors with pressure reduction design. These suppressors are specifically engineered to release the majority of the pressure contained in the device and bore prior to the operating system beginning extraction, which significantly reduces the negative effects of suppressor integration, and reduces felt recoil compared to a traditional suppressor with the same level of sound reduction. Muzzle flash, and specifically first-round flash, has also been directly addressed and minimized with the PRT design. The Quick Disconnect (QDC) mounting method ensures reduced carbon-lock, as well as minimal but repeatable point of impact shift when transitioning between suppressed and unsuppressed configurations. For interval maintenance, the PRT devices can be cleaned with commonly used bore solvents or ultrasonic tank cleaning with a water rinse. The Knight's Armament 5.56 QDC/CRS-PRT connects to all 5.56 QDC Muzzle Devices. 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 - Addition to Bare Muzzle: 5.67″ (14.41cm) - Addition to QDC 3-prong FH: 4.15″ (10.55cm) - Overall Length: 6.25″ (15.88cm) - Weight: 19.2oz (545g) - Sound Reduction: 24dB ** 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/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black#webpage","@type":"WebPage","description":"Black 5.56 NATO suppressor with Pressure Reduction Technology, QDC mounting, 6.25\" overall length, 19.2 oz weight, and 24 dB sound reduction.","name":"Knights Armament 5.56 NATO QDC/CRS-PRT Suppressor","url":"https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black","about":{"@id":"https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black#/schema//kygunco"},"breadcrumb":{"@id":"https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black#breadcrumb"},"isPartOf":{"@id":"https://www.kygunco.com/#website"},"potentialAction":[{"@type":"ReadAction","target":["https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black"]}]},{"@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/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black#product","@type":"Product","description":"Black 5.56 NATO suppressor with Pressure Reduction Technology, QDC mounting, 6.25\" overall length, 19.2 oz weight, and 24 dB sound reduction.","gtin":"819064018667","mpn":"121567-BLK","name":"Knights Armament 5.56 NATO QDC/CRS-PRT Suppressor","sku":"234659","additionalProperty":[{"@type":"PropertyValue","name":"Model","value":"556 CRS"},{"@type":"PropertyValue","name":"Finish","value":"Black"},{"@type":"PropertyValue","name":"Caliber","value":"5.56 NATO, 223 Rem"},{"@type":"PropertyValue","name":"Action","value":"Silencer"}],"brand":{"@type":"Brand","name":"Knights Armament"},"image":["https://cdn.kygunco.com/assets/products/234659/thumbnail.jpg?v=1712147221"],"mainEntityOfPage":{"@id":"https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black#webpage"},"offers":{"@type":"Offer","availability":"https://schema.org/OutOfStock","price":1246.88,"priceCurrency":"USD","url":"https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black","itemCondition":"https://schema.org/NewCondition","priceValidUntil":"2027-12-30T00:00:00.000Z"},"weight":{"@type":"Mass","value":"1 lb"}},{"@id":"https://www.kygunco.com/product/knights-armament-121567-blk-5.56-qdc-crs-suppressor-black#breadcrumb","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","name":"Home","item":"https://www.kygunco.com","position":1},{"@type":"ListItem","name":"Shooting","item":"https://www.kygunco.com/category/shooting","position":2},{"@type":"ListItem","name":"Guns","item":"https://www.kygunco.com/category/shooting/guns","position":3},{"@type":"ListItem","name":"Class III","item":"https://www.kygunco.com/category/shooting/guns/class-iii","position":4},{"@type":"ListItem","name":"Suppressors","item":"https://www.kygunco.com/category/shooting/guns/class-iii/suppressors","position":5},{"@type":"ListItem","name":"KNG-121567-BLK","position":6}]},{"@id":"https://www.kygunco.com/#/schema/image/1","@type":"ImageObject","contentUrl":"https://cdn.kygunco.com/assets/backdrops/facade.jpg","inLanguage":"en","url":"https://cdn.kygunco.com/assets/backdrops/facade.jpg"}]} ``` ## Sitemap See the full [sitemap](https://www.kygunco.com/sitemap.md) for all pages.