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WarBlock Upper Builder

WarBlock Upper Builder


WarBlock Upper Builder

Please begin by choosing the desired gas system, then click the “Build Your Own” button below to enter the builder.

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Build your own complete upper utilizing the WarBlock, ready to rock. Starting out the platform is the WarBlock itself expertly aligned and pinned to a Faxon barrel and then mounted to top quality A4 Aero Precision receiver using premium components from Daniel Defense, Rock River Arms, and Del-Ton. Next choose the model of WarBlock; the standard with a built in bayonet lug, or the LiteHunter without it. Moving on to the hand guard selection are the popular and affordable Magpul polymer MOE featuring the M-LOK mounting slots. The standard length MOE M-LOK is shorter and exposes the WarBlock allowing you to retain the use of the built-in QD sling swivel socket, while the SL hand guard extends past and partially shrouds the WarBlock to better protect you from contact burns and helps to make the whole package more streamlined. Following that you have your choice of M16 bolt carrier group including the military standard Parkerized/chrome lined, the harder and more corrosion resistant QPQ nitrided, or pinnacle of anti-friction surface coatings, EXO Fail Zero nickle boron (NiB). No upper is complete without a charging handle and we have several to choose from. The tried and true MIL-STD charging handle, or you can really tip the scales towards excellence with a Bravo Company Gun Fighter Mod4 or A44 ambidextrous charging handle, both in a medium latch size. Not too small to be ineffective, and not too big to be a potential snag hazard. You now have a technically complete upper, but there is one more option that we advocate heavily and that is iron sights. Even with the pervasiveness of red dots and optics, we believe that the actual sights of the weapon are the irons and that no rifle is ever complete without them. Here you have your choice of any combination of the exceptional all steel and Melonited Magpul MBUS Pro irons. Your done, and you now have the essentials all selected and visualized, and now ready to built to order.

*All of our WarBlock uppers contain only the highest quality premium American made name brand components*

Please choose your options from the drop down menus




Forged 7075-T6 Aluminum

MIL-A-8625F Type 3 Class 2 Black Hard Coat Anodize

A4 Picatinney Railed Flat Top

Laser Engraved T-slot Markings

Bolt Carrier Group

MIL-Spec carrier and proper staking. Permatex sealed

M16 Full Auto Carrier

Material Specs:

Carrier: 8620 Heat Treated: Parkerized/Chrome lined, QPQ Black Nitride, EXO Fail Zero NiB

Bolt: 9310 Heat Treated – Magnetic Particle Inspected: Parkerized/Chrome lined, QPQ Black Nitride, EXO Fail Zero NiB

Extractor: S7 Tool Steel, Black O-ring

Bolt has been Shot peened and Magnetic Particle Inspected


Faxon barrels are QPQ salt bath nitrided 4150CMV steel with M4 feed ramps

  • Barrel Material: 4150
  • Barrel Type: Button Rifled
  • Barrel Caliber: 5.56 NATO
  • Barrel Twist: 1:8
  • Inside Finish: QPQ Nitride
  • Outside Finish: QPQ Nitride
  • Muzzle Thread: 1/2-28 TPI (Threads Per Inch), 5/8-24 TPI (300BLK)
  • Gas Block Diameter: .750″, .625″ (GUNNER)
  • Gas Block Journal Length: 1.9″
  • Barrel Extension: M4
  • Magnetic Particle Inspected!
  • 11-degree Target Crown

Muzzle Device

Properly clocked A2 style birdcage flash hider with crush washer

Hand Guard

Polymer Magpul MOE M-LOK or the extended M-LOK-SL in three different colors: Black, Flat Dark Earth, or OD green

Charging Handle

Standard MIL-STD, BCM Gunfighter Mod4 (medium latch), BCM A44 ambidextrous charging handle

7075-T6 aluminum

MIL-SPEC hard coat anodize

Gas Block

Own own War Machine WarBlock 75 made of heat treated and QPQ salt bath nitrided 4140 steel

Receiver height 4 slot 1913 Picatinney rail

Bayonet lug

QD sling swivel socket

Pinned to barrel using MIL-STD 2/0 taper pins




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