RCBS Primer Pocket Uniformer – Small & Large

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RCBS 90378 / 90379
Uniformly rework primer pockets inside a case
Carbide uniformer with 8-32 thread – optionally Large Rifle or Small Rifle / Small Pistol.
Choose size consciously

Black-Raptor classification The uniformer cuts the bottom and wall of the primer pocket. The decisive factor is the primer size, not the bullet caliber. The tool removes material and is neither a cleaner nor a military crimp remover.

Does this fit your project?


Fits well if …
you clearly know the correct primer size
your case prep system has an 8-32 mount
you prepare sorted primer pockets with a repeatable process



Fits less if …
you want to treat Large Pistol on suspicion with Large Rifle
you only want to clean residues or remove a military crimp
you expect a handle or drive device included



What the product practically brings you


Carbide cutter Processes bottom and wall of the primer pocket with shape stability at controlled feed.


Two clear variants 90378 for Large Rifle; 90379 for Small Rifle and Small Pistol.


8-32 interface For suitable case prep devices, including confirmed RCBS systems.


Limits, disadvantages and avoiding bad purchases
Large Rifle is not automatically Large Pistol. For foreign systems, there is no general approval despite the 8-32 thread. Because material is removed, side pressure, excessive feed, and repeated re-cutting must not determine the workflow.
Technical data with practical consequences


Large Rifle RCBS 90378 – variant for large rifle primers
glocken.


Small Rifle / Pistol RCBS 90379 – variant for small rifle and pistol primer pockets.


Cutting material carbide.


Thread 8-32 external thread.


Purpose to uniform primer pocket; no cleaning and no crimp removal.


Origin USA.


Application and safety
Only process empty, cleaned, and undamaged cases. Wear safety glasses. Guide the tool straight, cut briefly with low feed, and check the result. Do not use damaged cutting edges or threads. Follow the speed and mounting instructions for motorized devices.
Scope of delivery
1 × RCBS Primer Pocket Uniformer in the selected size. Handle, drive device, adapter, primer pocket cleaner, and Military Crimp Remover are not included.
Frequently asked questions
Which variant is correct for Small Pistol? The variant 90379 Small Rifle / Small Pistol. Can 90378 be used for Large Pistol? That is not confirmed. Do not equate Large Rifle and Large Pistol. Does the tool remove a military crimp? No. A dedicated Crimp Remover or Swager is required for that. What thread does it have? Both variants have an 8-32 thread. Is a handle included? No. The uniformer is delivered in the selected size.
Clear purchase decision
Useful for users with confirmed primer size and matching 8-32 mount. It is the wrong tool for cleaning, crimp removal, or unclear size selection.