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.

Specifications and Features:
Windham Weaponry KITMCS1
MCS Multi-Caliber Conversion Kit
.223 Remington / .300 AAC Blackout
16" Chrome Lined 4150 Chome Moly Vanadium Steel
Manganese Phosphate Finish
Rifled appropriately for intended caliber
Upper Receivers are CNC machined from Forged 7075 T6 Aircraft Aluminum
Hard Coat Anodized Matte Black
Bolts are machined from Carpenter 158 Steel
Railed Gas Block
A2 Flash Hider
Matte Black

Fits:
Standard Pattern AR-15 Lower Receivers

Includes:
Complete Flat Top Upper Receiver with integral railed fore end and proprietary barrel release lever and barrel retaining block
.223 Remington Caliber Barrel
.300 AAC Blackout Caliber Barrel
.223 Rem/.300 AAC Blackout Complete Bolt Carrier Group