The Redding Large Slide Bar Primer Arm Assembly (MPN 99587) is a mechanical reloading press primer arm assembly engineered for the Redding Slide Bar Automatic Primer Feeder system (MPN 99600). Designed for bench-mounted reloading setups, this unit feeds Large Rifle, Large Pistol, and standard Large Magnum primers directly into the press ram channel on stroke. It allows handloaders to complete rapid primer size conversions without dismantling small seating pins and primer cups from existing arms, or serves as a direct factory replacement for lost or worn components.

Key Features

• Rapid Primer Setup Conversions: Eliminates the need to disassemble individual cups and seating pins by swapping in a dedicated, pre-assembled large priming bar.
• Complete Mechanical Assembly: Includes the factory large primer slide bar, seating pin, primer cup, return spring, and threaded ball knob.
• Dedicated Feeder Integration: Interfaces directly with the Redding Slide Bar Automatic Primer Feeder unit fitted to supported Redding reloading presses.
• Manual Mechanical Operation: Operates entirely via mechanical press linkage without requiring electrical power or electronic accessories.

Specifications

• Brand: Redding Reloading Equipment
• Model / MPN: 99587
• Product Type: Large slide bar primer arm assembly
• Operation: Manual / mechanical
• Primer Size Compatibility: Large primers only (Large Rifle, Large Pistol, Large Magnum)
• Press Compatibility: Redding Big Boss, Big Boss II, and T-7 Turret presses equipped with the Slide Bar Auto Primer Feeder (MPN 99600)
• Included Parts: Slide bar, primer cup, seating pin, return spring, and threaded ball knob

Who is the Redding Large Slide Bar Primer Arm Assembly for?

• Handloaders using Redding Big Boss, Big Boss II, or T-7 Turret presses — accommodates high-volume workflows by providing a drop-in primer arm assembly configured exclusively for large primers, matching the mechanical feed channel of the Redding slide bar auto primer feeder system.
• Reloaders processing large rifle or large pistol cartridges — delivers reliable priming seating for large primer dimensions, allowing users to swap out smaller primer tooling instantly without disassembling pins and cups.

Less suitable for: Handloaders seating small rifle or small pistol primers in calibres such as .223 Remington or 9mm Luger; these applications exceed the size threshold of this unit and require a dedicated small slide bar primer arm assembly (such as Redding Item No. 99586).