Description
MEC – EZ Prime for Single Stage Loader 12 Ga
Forget fumbling with primers, this is an easy way to “hot rod” your MEC single-stage reloader. This accessory speeds up handloading and allows you to pay attention to other, more critical loading steps.

The E-Z Prime Automatic Primer Feed eliminates handling individual primers and automatically feeds them for use.
Technical Information:
Fits: MEC Single Stage any 600JR, 600JR Mark 5, Sizemaster, or Steelmaster loader.
Application: Converts presses to automatic priming.
On earlier models of the 600 Jr. and 700 VersaMEC (Mid-70s and before) the hole in the turret for the reprime punch bolt was 1/4″ diameter. After this the hole was enlarged to 1/2″ diameter and a bushing was added to accommodate the addition of a primer feed later. If you have one of the older models, you will have to drill out the existing 1/4″ hole to 1/2″.
Kit Includes:
- Tray Assembly
- Bracket Assembly
- Actuator Chain
- Complete installation instructions included.






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