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With the ongoing madness of the COVID-19 situations, the unprecedented high demand for our products, and that many manufacturers are unable to keep up with the demand, you may encounter delays in shipping or the unavailability of inventory. We are making every reasonable effort to deliver products however, Thank You for your patience.

Windham Weaponry

Windham Weaponry Multi-Caliber Rifle RMCS-4

Product Code : 848037040725

Mfg Item #: RMCS-4


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Windham Weaponry's RMCS-4 kit offers four calibers in the same AR platform by simply changing out barrels, magazine wells, and if necessary, the bolt/bolt carrier and magazine. The 9mm barrel has a melonite finish, and the other barrels are chrome-lined for long wear and easy cleaning - machined from 4150 chrome moly vanadium steel and finished in black manganese phosphate. The receivers are CNC machined from forged 7075 T6 aircraft aluminum with a black hardcoat anodized finished, and the bolts are machined from Carpenter 158 steel.

SeriesRifle Kit
Weight7 lbs
Caliber223 remington300 aac blackout762x39mm9mm
Barrel TypeInterchangeable
Barrel Lengths16.2"
Stock Description6-Position Synthetic Black

Determined at checkout.