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A Multi-Cal Rifle System “To Go”

Components of the Windham Weaponry MCS Multi-Caliber System have been configured into an easily carried back-pack survival system for those wanting to take it afield, or keep handy for survival scenarios. It includes MCS Upper & Lower components for .223/5.56mm caliber, 9mm and .22LR caliber, as well as emergency gear such as a space blanket, water filtration kit, sewing, fishing and fire starting gear – all packed into a quality, multi-layer, compartmented backpack (shown below both closed, and opened to its several layers).

The Bug-Out Bag System consists of:

  • RMCS Lower Receiver with .223 & 9mm interchangeable Magazine Wells
  • RMCS Upper Receiver with fixed Quad Rail Forend and Barrel Locking Mechanism
  • 2 Barrels: 16” .223 Rem. / 5.56 NATO in M4 Profile, Chrome Lined w M4 Feed Ramps & a 16“9mm Barrel with Melonite Finish – also a 9mm Blowback Bolt, and a 9mm Buffer
  • 3 Calibers: .223/5.56, 9mm & .22LR (functions with CMMG conversion kit and fires through .223 barrel)
  • Magazines: .223 Rem/5.56 NATO – 30 Rounds / 9mm – 20 Rounds and .22LR – 25 Rounds
  • Rifling: .223/5.56 Bbl. – 1 turn in 9” – 9mm Bbl. – 1 turn in 10”
  • Buttstock: Mission First Tactical (MFT) Minimalist Stock
  • Forend: Integral Free Floating Quad Rail Forend
  • Pistol Grip: A2 Black Plastic Pistol Grip
  • Rear Sight: None, ready for accessory sights or optics of choice
  • Front Sight: None, Mil Std 1913 Rail Gas Block ready for accessory sights
  • Includes: Compartmented Backpack with pouches for all components constructed of Lightweight Nylon Shell and
  • 500 Denier Nylon interior for maximum durability; Shoulder Straps & Waist Belt; Space Blanket, Frontier Straw Water
  • Filtration Kit; Sewing Kit, Fishing Kit & Fire Starter Kit.
  • Warranty: Windham Weaponry Transferable Lifetime Warranty

*This comprehensive Survival Kit is packed in a 9“ X 6“ Waterproof Aloksak Bag (made in the USA), and its Mil-Spec Repair Kit in a 5“ x 4“ Aloksak Bag (made/assembled in the USA). Click here to view the content or to purchase separately.


  • Three Calibers
  • .223 Rem.-5.56mm NATO / 9mm / .22LR Calibers
  • UPC: 848037048226

The Windham Weaponry Lifetime Warranty.

The Details...

Lifetime Warranty

Windham Weaponry is proud to offer the highest quality rifles made anywhere. As testament to that quality, we back our rifles with a Lifetime Warranty that is also transferrable to subsequent owners.

To purchase Windham Weaponry firearms, please see your local FFL Dealer for details.