• Kristin Thompson

Son of a Gun

Updated: Jun 20, 2019


Miller introduces the newest addition to their MIG gun line-up with the MDX series, with improved operator comfort and superior wire feeding.


The new MDX series of MIG guns from Miller replaces the old outdated guns and consumables, allowing the user the ability to do their best work.

Designed with comfort in mind, each model features an ergonomic handle and improved grip with the introduction of rubber over-molding. User fatigue is also addressed with the addition of a ball and socket swivel.

The MDX series consists of three different gun models, MDX-100, MDX-250 and MDX-250 EZ-SELECT, all which are compatible Miller AccuLock MDX Series consumables.


Simple to set up and maintain, the MDX-100 makes any project easier. The re-designed, comfortable gun handle allows for free range of motion for the user while reducing fatigue. The coarse contact tip threads make liner trimming a breeze and replacement even easier, with no measuring required, which reduces burnbacks, bird-nesting and erratic arc caused by liners that are too short.

Processes: Aluminum Welding, MIG (GMAW)

Amperage Rated Output: 100A

Cable Length: 10 ft

Wire Size: .030 - .035

Consumables: Compatible with Miller AccuLock MDX Series consumables

The MDX-100 pairs with the following:

Millermatic 141

Millermatic 211

Multimatic 215

Multimatic 220 AC/DC


Equipped with all the same features as the MDX-100, the Miller MDX-250 model also contains extra copper in the cable, making it the go-to choice when welding with advanced processes, such as CV and pulse waveforms, when a much higher conductivity is required.

Processes: Aluminum Welding, MIG (GMAW), Pulsed MIG (GMAW-P)

Amperage Rated Output: 250A

Cable Length: 10 ft

Wire Size: .030 - .035

Consumables: Compatible with Miller AccuLock MDX Series consumables, and Bernard AccuLock S consumables

The MDX-250 is compatible with the following:

Millermatic 212 Auto-Set

Millermatic 252

Millermatic 255

Multimatic 200

Multimatic 255


With the same construction as the MDX-250, the EZ-SELECT gun option also adds a program trigger feature. This allows the user to switch between up to four weld programs, simply by tapping the gun trigger. This saves time walking to and from the actual power source to make changes. LED lights on the handle itself indicate which weld program is currently selected.

Processes: Aluminum Welding, MIG (GMAW), Pulsed MIG (GMAW-P), RMD

Amperage Rated Output: 250A

Cable Length: 15 ft

Wire Size: .030 - .035

Consumables: Compatible with Miller AccuLock MDX Series consumables, and Bernard AccuLock S consumables

The MDX-250 EZ-SELECT is compatible with the following:

Millermatic 255

Multimatic 255


Two separate series of AccuLock consumables are available for use with the MDX MIG guns. The Miller AccuLock MDX series and the Bernard AccuLock S series.

Both series of consumables feature tapered connections between the contact tip, gas diffuser and neck to maximize conductivity and add to the performance of all the MDX series MIG guns. Providing a flawless wire feed path, without the need for set screws, the front-loading liner locks into place and aligns concentrically with both the contact tip and power pin.

Bernard AccuLock S series is a great upgrade for the durability and consumable life in heavier industrial environments.

. Miller AccuLock MDX Series consumables available with the following:

MDX-100

MDX-250

MDX-250 EZ- SELECT

Bernard AccuLock S consumables available with the following:

MDX-250

MDX-250 EZ-SELECT

*Miller offers conversion parts to retrofit older style Miller MIGmatic M-Series guns with AccuLock MDX and AccuLock S consumables.

*M-Series consumables will not be compatible on the new MDX Series MIG guns.

Download the MDX MIG Gun brochure