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The new MDX series of MIG guns from Miller replaces the old outdated guns and consumables, allowing the user the ability to do their best work.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

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 (As of 2023, replaced by the Multimatic 235)

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:

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:
Bernard AccuLock S consumables available with the following:
*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.