The Lee Precision Breech Lock Spline Drive Bushing / Lock-Ring Eliminator (MPN 90063) is a specialised reloading die bushing designed to integrate split-collar die locking directly into the Lee Breech Lock quick-change system. Supplied as a 2-pack, each bushing accepts industry-standard 7/8"-14 threaded reloading dies and clamps directly around the die body using an integral cross-bolt fastener. Once locked in position, the assembly allows metallic cartridge reloaders to remove and reinsert dies in seconds with a 1/6th turn into Breech Lock-equipped presses without losing precise depth or seating adjustments.

Key Features

• Lock-Ring Elimination: Integrates a split-collar clamp directly into the Breech Lock bushing body, removing the requirement for a separate standalone lock ring on each die.
• Positional Retention: Clamps firmly onto 7/8"-14 die threads using an integrated screw tightened with a standard 3/32" hex key, holding die depth settings securely without stripping threads during repeated removal.
• Splined Exterior Drive: Features a ribbed spline outer profile designed for positive finger grip during quick die swaps, which also mates directly with Lee's dedicated spline drive die wrench.
• Interrupted-Thread Quick Swaps: Facilitates rapid, tool-free transitions between sizing, expanding, bullet seating, and crimping operations on compatible presses.

Product Specifications

• Model Number (MPN): 90063
• Die Thread Standard: 7/8"-14 thread
• Press System Compatibility: Reloading presses equipped with the Lee Breech Lock interrupted-thread receiver
• Package Quantity: 2 individual Breech Lock bushings
• Required Tooling: 3/32" hex key (Allen wrench) for integral clamp adjustment
• Packaged Dimensions: Approximately 130 mm × 100 mm × 40 mm (5.0 in × 3.8 in × 1.4 in)
• Packaged Weight: Approximately 0.05 kg (36 g to 50 g / 0.08 lbs)
• Power Requirements: None (100% mechanical)

Who is the Lee Precision 90063 Breech Lock Lock-Ring Eliminator for?

• Metallic cartridge handloaders running Lee Breech Lock presses — provides a dedicated Breech Lock bushing that eliminates separate lock nuts by clamping directly around standard 7/8"-14 threaded reloading dies using a 3/32" hex key to preserve precise depth settings across die changes.
• Reloaders performing frequent die swaps across handgun and standard rifle calibres — supplies a 2-pack of reloading die breech lock bushings to set up multiple 7/8"-14 dies for instant, 1/6th-turn removal and reinsertion without losing critical seating or sizing dimensions.

Less suitable for: Standard reloading presses lacking the Lee Breech Lock interrupted-thread receiver, which require traditional 7/8"-14 cross-bolt lock rings, and large-series reloading applications utilising 1-1/4"-12 or 1-1/2"-12 magnum dies, which require large-calibre dedicated press adapters.