--- title: "SIG SAUER MPX Caliber Exchange Kit 9mm 4.5\" Black Nitride" canonical_url: "https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride" meta: author: KYGUNCO "og:image": "https://cdn.kygunco.com/assets/products/234814/thumbnail.jpg?v=1713448055" "og:image:height": "500" "og:image:width": "500" "og:title": "SIG SAUER MPX Caliber Exchange Kit 9mm 4.5\" Black Nitride" --- > 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) / [Rifle Kits](https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts/rifle-kits) / SGS-CALX-MPX-4B-9-G2 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/234814/main.jpg?v=1713448055) For illustration purposes only, this image may not be an exact representation of the product. # SIG SAUER MPX Caliber Exchange Kit 9mm 4.5" Black Nitride $734.85 ** 5 interest-free payments of **$146.97** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** ![Credova logo](https://www.kygunco.com/brands/credova.svg) As low as **$131.19**/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 Almost gone. Order now before it sells out. Item # 234814 Style CALX-MPX-4B-9-G2 UPC 798681555062 Condition New Manufacturer [Sig Sauer](https://www.kygunco.com/brand/sig-sauer) Weight 1 lb This is a 4.5" barrel for the Second Generation of the MPX Platform. - Model: MPX - Dimensions: Caliber Exchange - Material: Carbon Steel - Trigger: Nitride - Finish: Nitride ** 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 Sig Sauer ```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/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride#webpage","@type":"WebPage","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"SIG SAUER MPX Caliber Exchange Kit 9mm 4.5\" Black Nitride","url":"https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride","about":{"@id":"https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride#/schema//kygunco"},"breadcrumb":{"@id":"https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride#breadcrumb"},"isPartOf":{"@id":"https://www.kygunco.com/#website"},"potentialAction":[{"@type":"ReadAction","target":["https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride"]}]},{"@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/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride#product","@type":"Product","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","gtin":"798681555062","mpn":"CALX-MPX-4B-9-G2","name":"SIG SAUER MPX Caliber Exchange Kit 9mm 4.5\" Black Nitride","sku":"234814","additionalProperty":[],"brand":{"@type":"Brand","name":"Sig Sauer"},"image":["https://cdn.kygunco.com/assets/products/234814/thumbnail.jpg?v=1713448055"],"mainEntityOfPage":{"@id":"https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride#webpage"},"offers":{"@type":"Offer","availability":"https://schema.org/InStock","price":734.85,"priceCurrency":"USD","url":"https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride","itemCondition":"https://schema.org/NewCondition","priceValidUntil":"2027-12-30T00:00:00.000Z"},"weight":{"@type":"Mass","value":"1 lb"}},{"@id":"https://www.kygunco.com/product/sig-sauer-calxmpx4b9g2-mpx-caliber-exchange-kit-9mm-4.5-black-nitride#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":"Gun Parts","item":"https://www.kygunco.com/category/shooting/gun-parts","position":3},{"@type":"ListItem","name":"Handgun & Rifle Parts","item":"https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts","position":4},{"@type":"ListItem","name":"Rifle Parts","item":"https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts","position":5},{"@type":"ListItem","name":"Rifle Kits","item":"https://www.kygunco.com/category/shooting/gun-parts/handgun-and-rifle-parts/rifle-parts/rifle-kits","position":6},{"@type":"ListItem","name":"SGS-CALX-MPX-4B-9-G2","position":7}]},{"@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.