Major Components

The Dillon M134D Minigun is the finest small caliber, defense suppression weapon available. It is a six barreled, electrically driven machine gun chambered in 7.62mm NATO and fires at a fixed rate of 3,000 shots per minute. Miniguns typically feed from a 3,000 or 4,000-round magazine. They are capable of long periods of continuous fire without threat or damage to the weapon making them an excellent choice for defensive suppression.

Major components of the Dillon M134D are:

  • Barrel
  • Barrel Clamp
  • Bolt Assembly
  • Clutch
  • Feeder Delinker
  • GAU-2B/M134 Minigun Modernization/Upgrade Kit
  • Gear Head
  • Gun Control Unit (GCU/RGCU)
  • Gun Drive Motor
  • Gun Housing
  • Link and Brass Exhaust
  • Rotor
  • Spade Grip
  • Top Cover and Safing Blade Assembly


    • Description

      The family of barrels for the M134D is the result of thousands of man-hours and millions of rounds devoted to testing and development. Because of these efforts Dillon has been able to reduce the End Users dependency on replacement barrels by doubling barrel life expectancy. The original GE designed barrel required replacement every 100,000 rounds.

      The Dillon Barrel Group has a life of 200,000 rounds with barrel erosion gauging beginning at 125,000 rounds.

      Dillon Aero produces three types of barrels for the M134 family, the Standard Barrel, Heavy Barrel, and the new, lightweight Short Barrel.



      The Standard Barrel is an replacement/upgrade to the original GE production barrel. Dillon added an 1/8th inch of material to the diameter of the Standard Barrel making the taper consistent from breech to muzzle. The added material eliminates weak points that will fail when the barrels thermal limits are exceeded. Greater thermal resistance allows for longer firing times with greater resistance to barrel failure.



      The newest barrel for the M134 is the Dillon Short Barrel. The Short Barrel measures 18 inches in length while the diameter remains the same as the Standard Barrel. This reduction in length provides a significant reduction in weight while having a negligible impact on accuracy or thermal limitations.

      Weight: Each Dillon Short Barrel weighs 1.85 pounds. A full set of six is 11.1 pounds. Compared to the Standard Barrel set, which weighs 14.7 pounds, the Short Barrel set is 3.6 pounds lighter. A complete M134D-T with Short Barrels is 41.5 pounds. That is a significant reduction in weight.

      Accuracy: The muzzle velocity of an M134D Standard Barrel firing NATO 7.62MM Ball is 2750 Fps (+/-). The muzzle velocity of the new Dillon Short Barrel using the same ammunition is 2680 Fps (+/-). This translates to a difference of about six inches in aimpoint at 500 meters and 22 inches at 1,000 meters.

    Barrel Clamp

    • Description

      Dillon’s Barrel Clamp serves two functions. Primarily, it acts as a clamp, holding the barrel group in alignment. Second, it reduces flash emissions potentially interfering with the operator’s targeting acquisition by enabling the mixing of air with unburned powder. Dillon’s Barrel Clamp began life as a one-piece version of the two-piece GE Slotted Barrel Clamp. However, after extensive testing the slots were eliminated in favor of the slotless model. The advantages offered are increased flash suppression and decreased muzzle debris making the Dillon Barrel Clamp better suited for use with night vision goggles.


      • Currently in service with US military
      • Dillon’s one-piece design saves weight and reduces cost
      • Available in either stainless steel or titanium


    Bolt Assembly

    • Description

      The Dillon Gun Bolt set is comprised of six Dillon DA1000 Gun Bolts. Dillon Gun Bolts offer several important advances over the General Electric gun bolts. Firing pins found in GE bolts have blunt tips. Blunt tips can puncture the primer of a cartridge during the firing sequence. When this happens a portion of the hot gas is vented passed the firing pin and through the bolt. This has two effects. The first is to cause the firing pin to compress the firing pin spring rearward against the firing pin retention pin. If this happens enough times the firing pin spring will lose temper, which leads to light firing pin strikes on primers. These ‘light strikes’ may contain insufficient energy to fire the cartridge.

      The second effect of gas venting is to ‘etch’ the tip of the firing pin. The more the firing pin tip is damaged the more likely it is to puncture larger holes in the primer. At a certain point enough gas is vented into the bolt body that the bolt head retention pin may actually be sheared into three pieces, leading to catastrophic bolt failure.

      To solve these and other problems, Dillon patented and entirely redesigned the gun bolt for use in the Dillon M134D. The DA1000 bolt is completely compatible with the General Electric GAU-2B/M134.

      Dillon Aero’s bolts are amazingly strong and reliable. The firing pin tip is rounded, not blunt, to avoid primer puncture. In firing tests totaling well over one million rounds, Dillon bolts did not puncture a single primer. Because of this, Dillon springs last fifteen times as long as GE springs.

      Other improvements include dual, opposed guidance tangs that drive the bolt head into and out of the locked position. This is compared to the single tang GE bolt head which was susceptible to cracking.

      Also, bolt searing is simpler and more reliable. GE bolts have a boss on the rear end of the firing pin that engages a track in the gun rotor. With Dillon bolts the sear is contained within the bolt head and is triggered by bolt compression. This feature makes rotor design less complex and less expensive.



      • More than 10,000 units currently in service with US and foreign military
      • Gun bolt service life of 250,000 rounds
      • Dillon gun bolts require no maintenance aside from normal lubrication and inspection
      • Dillon firing pins are internally seared so there is no interface between the firing pin and rotor
      • Dillon gun bolts are designed to prevent “off-center” firing pin strikes
      • Dillon firing pins have spherical ends which eliminate punctured primers



    • Description

      Dillon’s DAC3000 Clutch Assembly is integral to the operation of the Dillon Feeder/Delinker. Its function is to control the engagement/disengagement of the delinker in time with the gun.

      The DAC3000 also ensures the weapon is clear of live ammunition each time the trigger is released. When the gun trigger is pressed, power is delivered to the gun and to the clutch. The clutch then engages the delinker drive gear, causing the delinker to feed ammunition to the gun. When the trigger is released, power is first removed from the clutch, which disengages the delinker, stopping the flow of ammunition. A time delay relay continues to turn the gun barrels until the six remaining rounds are fired. In this way the M134D is always free of live ammunition. Also, since there is no live ammunition in the chambers after firing, the M134D is not susceptible to accidental discharges resulting from ‘cook-offs’.

    Feeder Delinker

    • Description

      The DAFD2000-1 Feeder/Delinker is the single most important upgrade to any GAU-2B/M134. Its function is to delink ammunition, then feed it to the gun. On General Electric Miniguns this job was performed by the MAU-56. While similar in appearance to the Dillon Feeder/Delinker, the MAU-56 suffers from several shortcomings, making the system susceptible to failure. In fact, failures encountered during the normal operation of the MAU-56 often lead to a complete overhaul.

      In contrast, the Dillon DAFD2000-1 Feeder/Delinker is extremely reliable. The unit has a ‘mean-time-between-failure’ of 500,000 rounds. Delinker stoppages are also rare. This is due in part to the high strength of internal construction and the way in which the Dillon Feeder/Delinker retains lubricant while channeling dirt and debris, which can cause a stoppage.

      In the unlikely event of a stoppage, the Dillon Feeder/Delinker is equipped with unique twin hatches. These hatches simplify stoppage clearance, a process that takes less than a minute.

    GAU-2B/M134 Minigun Modernization/Upgrade Kit

    • Description

      In addition to new production M134D Miniguns, Dillon Aero also provides a GAU-2B/M134 Minigun Modernization/Upgrade Kit for early generation General Electric (GE) GAU-2B/M134 Miniguns. The kit ensures that hundreds of Miniguns, formerly rendered obsolete by poor reliability and a shortage of spare parts may be brought up to current standards.


      • Feeder/Delinker
      • Clutch Assembly
      • Bolt Assembly (6 each)
      • Removable Track (6 each)
      • Gun Control Unit (GCU)
      • Spade Grip
      • 3,000-round Gear Head and Gun Drive Motor
      • Top Cover and Safing Blade Assembly
      • One-piece Barrel Clamp

      Through the replacement of legacy components with the improved design of new production Dillon components, early generation GE Miniguns will deliver highly increased reliability and performance.

    Gear Head

    • Description

      The Gear Head that is installed on the Gun Drive Motor determines the gun’s rate of fire. Dillon Aero offers two different gear heads. The DMG0072 Gear Head fires the gun at a rate 3,000 shots per minute. This is the optimal rate of fire for gun performance and shot density. The optional DMG0002 Gear Head fires the gun at a rate of 4,000 shots per minute.

    Gun Control Unit (GCU/RGCU)

    • Description

      Earlier generation gun control units or fire control units came in a variety of shapes and sizes, though they typically shared certain characteristics. These systems tended to be large, heavy, and overly complex. Some GCU’s, consisting of multiple ‘black boxes’, could weigh more than 20 pounds. Designed with sensitive electronics, they could easily burn-up, leaving a gun unable to fire.

      Complexity was another serious shortcoming. In the event of a failure, it was unlikely that the unit could be returned to service without a trip to depot level maintenance. Typically, unit replacement cost was always high, and the sensitive nature of these early systems meant a large number of spares were necessary.

      Dillon Aero’s Gun Control Unit is a simple, yet highly robust system. The GCU controls all of the weapon’s functions. When either of the twin triggers is depressed the GCU performs the following actions:

      1. Power is delivered to the Gun Drive Motor.
      2. Power is delivered to the clutch, which in turn engages the Feeder/Delinker system.
      3. Power is delivered to the Ammunition Booster Motor.
      4. The ‘Time Delay Circuit’ is energized.

      When the GCU trigger is released, power is removed from the weapon. The DAC3000 Clutch disengages and the flow of ammunition to the gun is interrupted. After the clutch disengages, the Time Delay Circuit continues to supply power to the gun motor long enough to ensure that all remaining live rounds have been fired. There are no live rounds left in the gun.


      • Currently in Service with US and foreign military
      • Dual Firing Triggers provide redundancy
      • Guarded Master Power Switch
      • Night Vision Compatible
      • Optional Integrated ‘Intercom System’ switch available

      Dillon’s GCU is an integral part of the gun, housed in Spade Grips.

    Gun Drive Motor

    • Description

      The Dillon M134D fires at a rate of 3,000 shots per minute. This optimal firing rate is controlled by the Gun Drive Unit. The Gear Head is mounted on the front of the 28 Volt DC Drive Motor. An optional 4,000 shot per minute Gear Head is also available.


      • Currently in service with US and foreign military
      • Dillon’s Gun Gear Assembly is a simple, yet reliable method of controlling gun speed
      • 3,000 SPM is an optimal blend between gun performance and shot density
      • Optional 4,000 SPM Gear Head also available


    Gun Housing

    • Description

      The main Gun Housing provides mounting surfaces for the Drive Motor, Safing Top Cover, Feeder/Delinker and Spade Grips. Additionally, the Gun Housing contains the Rotor and Clutch.

      Located on the rear of the Gun Housing are four Spade Grip mounting lugs. The lugs provide a firm-mounting surface for the Spade Grips. This differs from older methods of mounting Spade Grips to the Clutch Housing, which tended to shift as the gunner moved the weapon.

      The Standard M134D and M134D-H housing is made from steel and has a part life of 1,500,000 rounds. After this limit has been reached, the housing is considered “serviceable on condition”. This simply means that as long as the housing checks within tolerance it may continue service.


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    • swivel-brass-and-link
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    • cev-brass-and-link
    • universal-brass-and-link
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    • Description

      At 3,000 shots per minute a Minigun will exhaust 50 cartidge cases and links every second. The management of such a high exhaust rate poses unique challenges. If not done correctly cases and links may become tangled into a thickly packed ball causing a weapon malfuntion. As with all other aspects of the Minigun, Dillon has spent a significant amount of time perfecting its link and brass solutions.

      For aviation, insuring that link and brass exhaust exit the aircraft in a controlled and safe manner is necessary to avoid fod hazards to aircraft rotor systems and skin.

      For land and maritme installations, directing the flow of brass away from the operators position prevents the contamination of the vehicle or boat interior. In certain cases, the addition of a dump tube may be desirable. The dump tube channels the flow of link and brass similar to the way a hose channels water. Pictured are the four general types of link and brass exhaust made by Dillon. However, numerous application-specific types exist.


    • Description

      At the center of the M134 is the Rotor. When the weapon is triggered the main drive motor turns the drive gear on the front of the rotor. This in turn drives the six gun bolts through the firing sequence. The bolts follow the cam path around the weapon housing while moving linearly along the rotor bolt track. From chambering and firing to extraction and ejection, each revolution of the rotor results in six rounds being fired.

      Dillon Guns Are Good For Life 
      Dillon Aero’s new, lightweight, long-life titanium rotors are designed to remain as good as new for years to come. With money to buy new guns hard to come by, it is always preferable to keep current weapons running. With this in mind, Dillon’s titanium M134D-T uses the new generation lightweight rotor.

      The rotor is the gun. That is, it is the part of the weapon that must be approved by congress to be purchased. Therefore, it is the service life of the rotor that determines the total life of the gun. Everything else is just parts.

      In addition to greatly reduced weight, this new rotor features replaceable locking lugs.

      The locking lug is the main wear item on the rotor and the rotor is what is actually considered the weapon. By making the lugs replaceable, the life of the rotor is extended into the millions of rounds. In essence, the weapon never wears out.