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
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.

    Sunday 10am - 5pm

    Monday 10am - 5pm

    Tuesday 10am - 5pm

    Wednesday 10am - 5pm

    Thursday 10am - 5pm

    Friday 10am - 5pm

    Saturday 10am - 5pm

    By Appointment Only

    999 Roosevelt Trail

    Windham, ME 04062


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