Skip to main content

Windham Weaponry Interchangeable AR-15 Kit .223/7.62×39 Caliber Upper

MSRP: $999.00


Switch between .223/5.56 and 7.62×39 with this quick change kit.

Out of stock

This product qualifies for free shipping!


Windham Weaponry is excited to offer it’s newest multi-caliber AR-15 convertible upper assembly. This exciting new development will allow you a huge leap in modularity for your favorite rifle, the AR-15. We all know that the AR-15 has become the most popular sporting rifle in American history and this Kit allows you to get hands on with other popular calibers and expand your AR-15 horizons. This revolutionary upper is designed to allow you to switch between barrels with great ease. Typically this task would have been impossible if not for the brilliant engineers in the Windham Weaponry R&D department. If you have been considering dabbling in other AR-15 calibers pick up one of these Windham MCS kits and see how easy the transition can be.


– Complete Flat Top Upper Receiver with integral railed fore end and proprietary barrel release lever and barrel retaining block
– .223 Remington Caliber Barrel
– 7.62x39mm Caliber Barrel
– .223 Remington Complete Bolt Carrier Group
– 7.62×39 Bolt
– 7.62×39 Magazine
Note that the 7.62 Bolts are marked with 3 rings behind the locking lugs so as not to be confused with the .223 caliber bolt.


– Caliber: .223 Remington / 7.62x39mm Soviet
– Barrel: 16″ Chrome Lined 4150 Chome Moly Vanadium Steel
– Finish: Manganese Phosphate
– Barrel Style: Rifled appropriately for intended caliber, A2 Flash Hider
– Upper Receiver: CNC machined from Forged 7075 T6 Aircraft Aluminum
– Finish: Hard Coat Anodized Matte Black
– Bolts: Machined from Carpenter 158 Steel
– Color: Matte Black


– Fits: Standard Pattern AR-15 Lower Receivers

Additional information

Weight11.25 lbs
Dimensions29 × 11.25 × 4 in

Have a question?

  • This field is for validation purposes and should be left unchanged.

Windham Weaponry Interchangeable AR-15 Kit .223/7.62×39 Caliber Upper for sale.

Categories: , ,

Tags: , , , ,


Manufacturer's SKU: KIT-MCS2

SKU: 300747

Product images are provided by the manufacturer and might not depict the actual product with 100% accuracy. Check the product description to verify it is exactly what you desire.

WARNING: This product contains a chemical known to the State of California to cause cancer. Also, drinking water and breathing heavily has been known to cause cancer by the state of California.

You may also like…