Zeus Arms Proteus Pistol 5.56/300BLK

This item is in the Gea Arsenal Catalog, but that does not mean that it is currently available. Please contact a Gea's Dealer to order.

Our Price

$1,850.00 Contact us for orders



  • Enhanced Flared Magazine Well
  • Type III Hard Coat Anodized
  • 7075-T6 aluminum
  • Precision CNC Machine broached magazine well
  • Accepts all mil-spec components

Buffer Tube Kit/Side Folding: AR15 / M16 Buffer Tube Kit – Standard Carbine with Side Folding Attachment

  • Mil-Spec dimension 7075-T6 6 position buffer tube – hard coat anodized
  • Carbine buffer
  • Castle nut – phosphate coated
  • Endplate – mil-spec phosphate coated
  • Buffer spring – Coated Music Wire

Brace: SB Tactical SBA3 Brace (Black)

Upper Receiver:

  • 7075-T6 aluminum
  • Machined from quality forgings
  • No T-Marks
  • Hard coat anodized
  • Fits any mil-spec style AR15 / M16 lower receiver


Cry Havoc Barrel QD Attachment allowes for barrel assembilies to be quickly removed for compact storage and to allow for quick barrel swaps between compatible calibers


  • 7.5″ length
  • 5.56 NATO Chamber
  • Pistol gas system
  • .750″ gas block journal
  • 1:7 RH twist
  • 4150 CMV
  • Stress relieved after rifling
  • Black Nitride finish
  • M4 extension
  • 100% USA Made
  • 8″length
  • 300Blackout Chamber
  • Pistol gas system
  • .750″ gas block journal
  • 1:7 RH twist
  • 4150 CMV
  • Stress relieved after rifling
  • Black Nitride finish
  • M4 extension
  • 100% USA Made

Muzzle Device: Equipped with flash can which is perfect for those applications that do not need recoil or flash reduction, but still need to focus muzzle blast and flash down range. Our flash cans are slim enough to fit under most handguards for that classic “SD” look. Because there is no direct impact on the muzzle device, the lightweight aluminum is not damaged during firing.

  • Machined from 7075-T6 aluminum
  • Hard coat anodized
  • Threaded 1/2-28
  • Outside diameter: 1.20″
  • Length: 1.75″
  • Weight: 1.7 ounces
  • 100% American Made


  • Machined from 6061-T6 aluminum
  • Hard coat anodized per milspec
  • 6061-T6 lightweight barrel nut
  • Top rail length: 7-9inches
  • MLOK mounting points at 3:00, 6:00, and 9:00

Gas System: Our Gas Block and our gas tube get nitride coated for better resistance against carbon build up than your standard stainless gas tubes.

  • Machined from 4140 pre-hardened steel
  • Black Nitride coated
  • Closed end gas tube hole
  • 100% USA Made

Ambi Charging Handle:

  • Body Manufactured to milspec dimensions
  • Fits all standard AR15 / M16 style firearms
  • Machined from a 7075-T6 forging for extra strength
  • Hard coat anodized – black

Bolt Carrier Group:

  • 8620 M16 style carrier
    • Black Nitride finish
    • Properly heat treated
    • Final grind before plating
  • Carpenter 158 5.56/.223 bolt
    • Heat treated
    • Shot peened
    • Precision ground for perfect dimensions
    • Black Nitride finish
    • MPI
  • 4140 billet gas key
    • Black Nitride Finish
    • Properly seated with Grade 8 fasteners
    • Properly staked to ensure reliability
  • 4140 Cam Pin nitride treated for wear resistance
  • Billet Machined Extractor
    • Machined from solid 4140 bar stock, heat treated and shot peened
    • Phosphate coated for reliable extraction
    • Extractor insert included
    • O-Ring included
  • Firing pin precision machined from 17-4 H-900 Stainless Steel
  • 100% USA Made

All Zeus Firearms ship with a hard case for easy transportation


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