Surgeon DOC SPR 6 ARC


The Surgeon DOC is a precision instrument that isn’t afraid to get into a fight.


  • *Barrel Material


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The Surgeon DOC SPR Specs

The Barrel

  • Proof Research high strength carbon fiber wrapped.
    • 18” 1:7.5 Twist 6 ARC full profile.
    • Rifle+1 length DI gas system for smoother cycling.
  • 416R Stainless Steel SPR Profile
    • 18” 1/7 twist QPQ finished
    • Rifle length gas system
  • Extended A2 flash hider for recoil reduction and muzzle rise mitigation.
  • Superlative arms adjustable gas block

The Handguard

  • 15 inches made from 6061 T6 Aluminum
  • Mlok at 3,6,9 o’clock as well as the 45 degrees cuts for versatile mounting options.
  • Full length picatinny on top rail.
  • Front and rear anti rotational QD points on both sides
  • Retention system and anti rotational tabs that prevents movement of handguard during use.

MD Enhance Colt Carrier Group

  • The beating heart of our rifles and there are no denying it has a strong heart.
  • Precision ground inside and out for a near frictionless surface ensuring long term reliably.
  • Armor Lube coating (advanced DLC and MILSPEC)
  • Bolt is machined from 9310 steel and properly heat treated, MPI and shot peened for superior strength and durability.
  • 100% American made and full auto capable.

Billet Gen 2 Lower Receiver

  • Lower receiver is billeted from 7075 T6 aluminum with a solid piece trigger guard and cut out shelf.
  • Right side bolt release
  • Flared mag well for faster reloads under stress.
  • Enhanced buffer tube features
    • Position drain holes to that easily removes water in maritime environments and prevents build up of gas and creating smoother cycling of BCG.
    • Carrier support extension that guides BCG into the extension prohibiting carrier tilt and excessive carrier wear while holding the buffer pin in place and making backing out under recoil impossible.
  • MD H1 buffer and stainless steel cryo treated flat wire buffer spring that eliminates “twang” noise and increasing forward pressure which greatly increases reliability.
  • Geissele 2 stage SSA trigger

Billet Upper Receiver

  • Billeted upper receiver from 7075- T6 aluminum to extremely tight tolerances to ensure proper cycling and a perfectly flat surface for flush fit for the barrel.
  • The barrel and the upper receiver are thermal fit to lock the barrel in for an extremely tight connection. This increases the rifles durability and gives it bolt like accuracy.

The Surgeon Doc SPR chambered in the 6 ARC is a performance masterpiece. If you are unfamiliar with the 6 ARC and it performance read here

Additional information


Precision ground, Heat treated, Shot peened, MPI

BCG Coating

ArmorLube Advanced DLC

Billet Upper

Billet 7075- T6 aluminum

Billet Lower

Billet 7075- T6 aluminum

The Barrel

Carbon Fiber wrapped 416-R Stainless Steel

Barrel Length


Barrel Twist




Hand Guard

6061 T6 Aluminum

Rail Mounting System

Mlok, Picatinny

Muzzle Threads


Gas System

Rifle +1


7.8 LBS


38.75 inches


6 ARC magizines




Geissele SSA two stage

Safety Selector


Charging Handle

Radian Raptor Ambi


E Series Cerakote on top of Type 3 Hardcoat Anodized

Buffer Weight


Buffer Spring

Proprietary Flat Wire

Barrel Material

Stainless Steel, Proof Carbon Fiber


Black, FDE, Jungle Green


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