M25, M40 Miller & Hobart 25A Style Mig Welding guns and parts are Made in the USA by Masterweld. M-25 and M-40 welding gun replacements meet or exceed OEM standards and specifications. "Ready to weld" Mig gun includes contact tip, nozzle and liner. The M25, 25A & M40 style Mig Guns are proudly Made in the USA and Used by Professionals Worldwide. Miller MIGmatic™ welding gun M25, M-40 are common on: Millermatic 200, 210, 212, 250, 250x, 251, 252, Millermatic 300 and current Miller wire feeders. 25A Hobart style are common on Hobart Ironman welders. M25, 25A & M40 Consumable parts interchange with standard, non-patented parts and accessories. Replacement for the MDX-250 Miller Mig Gun.