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Due to the recent increase in order volume, shipping on some items may be delayed up to 15 business days or longer. Items shipped from our own warehouse can be shipped much sooner than items shipped direct to you from one of our fulfillment suppliers. Additionally, our supplier network has currently prohibited the canceling or updating of all orders after they have been placed. We appreciate your patience during this time.

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Windham Weaponry

Windham Weaponry Multi-Caliber Upper Kit 223/300 KIT-MCS1

Product Code : 848037038463

$884.99

Mfg Item #: KITMCS1

Windham Weaponry's Multi-Caliber Upper Receiver Assembly Kit is designed as a unique upgrade for the AR15-type rifle, offering quick and easy caliber changes by simply switching out the barrel, and if necessary, the bolt/bolt carrier and magazine. Add the optic or iron sights of your choice, and this kit is "ready for the range." The barrel is chrome-lined and machined from 4150 chrome moly vanadium steel with a black manganese phosphate finish. The upper receiver is CNC machined from forged 7075 T6 aircraft aluminum with a hardcoat black anodize finish. The MCS 1 Kit includes a complete upper receiver assembly with .223/5.56mm caliber M4 barrel assembly; integral railed forend; (with barrel release levers, and barrel retaining block). Additionally, a .300 Blackout caliber barrel assembly is included allowing the change between .223/5.56mm caliber and .300 Blackout caliber by utilizing the same bolt/bolt carrier and .223 magazines. The .223/5.56mm bolt/bolt carrier and .223 magazines are utilized. The .300 Blackout caliber barrel assembly is complete with railed gas block, gas tube, and A2 flash hider.

TypeComplete Gas Impingement
Series223/300
SightsNone, Optic Ready
Caliber223 Remington/300 AAC Blackout
HandguardsQuad Rail
Barrel FinishBlack Phosphate
Barrel Length16"
Barrel Material4150 Chrome Moly Vanadium Steel
Handguard FinishBlack
Barrel DescriptionChrome-Lined
Barrel Length Range16.00" to 17.99"
Receiver Description7075-T6 Aluminum

Determined at checkout.