MEC Pro Check

The MEC Pro Check is a precision accessory engineered for reloaders who demand consistency and reliability in their ammunition production workflow. Designed specifically for use with the Mayville Engineering Co. Model 600JR loader, this compact device eliminates manual sequencing errors that can compromise round integrity or slow production cycles. Law enforcement, competitive shooters, and high-volume handloaders rely on charge bar programming tools like the MEC Pro Check to maintain the strict quality control standards required for duty ammunition and match-grade loads.

The MEC Pro Check attaches directly to your charge bar via the bar-stop screw, functioning as an automated sequence gate that enforces proper loading cycle progression. By programming the charge bar, this check device ensures that each stage of the reloading sequence—powder measurement, primer seating, and bullet placement—occurs in the correct order without operator deviation. The fixed positioning mechanism prevents progressive indexing errors that commonly occur during fatigue-induced manual cycling, particularly during long reloading sessions where consistency is critical. Weighing just 1.13 lbs with compact dimensions of 4.45 x 0.95 x 7.75 inches, the device mounts securely without adding bulk to your 600JR setup.

This accessory is essential for serious reloaders operating the Model 600JR who process high-round counts and cannot afford production delays or quality compromises. Installation requires only a standard screwdriver to engage the bar-stop screw—no gunsmithing expertise needed. The MEC Pro Check is compatible exclusively with Mayville Engineering Co. Model 600JR loaders and will not fit other brands or models. For anyone pushing volume through a 600JR platform while maintaining audit-trail consistency, this programmed check bar represents a smart safety and efficiency upgrade.